I'd be glad to shed some light on those situations for you. I may seem biased because admittedly some of my statements are critical of Andy and his performance of his GM role, but that's not really frustration as a player as much as it is frustration as a business operator and specifics in his behavior that run contrary to good business practices.
The minor imperfections littering the game, for the most part are understandable. The length that some have existed is a problem for sure, but I feel like everyone understands that in a perpetual game like this that appears to mainly have one employee tending the lighthouse so to speak, there will always be things to fix and any new change brings a potential new problem. I could be wrong but I don't get the distinct feel that players have a particular problem with that itself.
The problem with the statement that proper feedback has not been offered by players is that communication from the GM updating the game to the players that test and play the game's mechanics is very inconsistent. If you're just joining us recently, he may seem very active to you. Over time, however, his record is extraordinarily spotty. The GM will completely disappear from the game for weeks at a time without any word seemingly at random. Updates, when they happen, are actually frequently not announced at all. Players very frequently accidentally stumble upon changes of which no indication of any change had been given generally when those changes cause some sort of problem with the numbers that they had come to expect. When announcements for updates are made, they are often vague and give little actual information regarding the specifics of the changes and instead give the GM's personal feelings on what he hopes the changes accomplish. The announced changes are also very difficult to follow up on and keep track of due to the clunkiness of the forum, and the announcements are made only on the forum and not on the other pages (such as Game News) where they should be.
Players creating stock out of nothing, I completely agree with you is a problem. I may actually be the player that Andy was referring to when he spoke of a someone exposing a cheat of sorts as I started experimenting to find out how a player back in March/April was staring their account and almost instantly having astronomical amounts of money and military assets, mainly because that player began 'hostile bidding' on corporations of other players and causing considerable disruption. I was able to duplicate what I believe was the exploit he was using and reported it to Andy step by step. It didn't actually create products from nothing but it was a workaround that essentially gave the player unlimited spending space. I will say also, Andy seems to try to imply that the player that reported (me if this is the exploit he was referring to) also took advantage. I'll be glad to share the full e-mail that I sent to him on discord (even after being shown, I for whatever reason can't post images here) in which I specifically told him how many products I was able to get and told him he was free to remove them from the account as the experiment truly was to help pin down what the actual cheating player that I was hunting down was doing.
That is different from the Wind Farm / Electric Power situation, considerably. It doesn't take many Wind Farms to completely satisfy a country's month to month needs, and any excess goes straight into the country's stockpile. Because of the economic power Wind Farms generated at the height of their popularity, which admittedly was far too high but also players went out of their way to make Andy aware of and were ignored, many players have upwards of a couple thousand Wind Farms in each of their countries. Just 2,000 Wind Farms 15 million Electric Power units per actual day. Some players have 5,000 in a country, and have multiple countries. The players that can afford that amount also don't tend to be in a hurry to sell it because frankly they don't need the money. The Electric Power generated by Wind Farms doesn't factor into standard supply and demand, so the only way a player's generated Electric Power impacts world prices is if they try to sell it above and beyond current demand.
When players leave the game they do it in a variety of ways. Some like me just straight up deleted their countries and enterprises. Like the snap of a finger I erased a few quadrillion worth of assets from the game because I didn't even bother to move assets into direct trade storage. Some players, that had refrained from selling their excessive Electric Power generated by their farms because they didn't want to drive the price down, do what they can to help players on their way out by dumping supplies they have on hand. The player that Andy is referencing as being essentially an evil anarchist by dumping everything he had and turning most market situations to surplus, is actually good for the newer player. Absolutely him dumping his inventory means product prices are going to drop while they remain in surplus. So you will make less money on products you are selling. But look at the big picture. You are now in a position to buy up products that you know are underproduced at what can end up being a steep discount. That inventory that the player is selling will actually make shortages that were being experienced before he sold them worse, because C3 corporations tend to close down when products they produce are in surplus, and for products that are being underproduced (like the Oil that he was selling), it presents a great opportunity to buy and hold onto products yourself until all of that inventory is sold off and the market returns to its equilibrium and prices return to normal, because overall production supply and demand only tips the scale to more shortage when players do these dumps over the long term. I can't defend the multiple accounting, but the product dumping, even with the player saying they wanted to watch the market burn, it really was for the better long term for any active player that would take advantage of the influx of products that are normally in deep shortage. The temporary setbacks would have been more than made up for by shifting your spending space to buying products at a premium that you could then later flip for double or even triple the price you paid.