3 Corp p/m booster

You should be able to turn the 3 corps build per month booster on and off. So that you can use it when you have the cash

Sounds like a good idea but:

you decide on which corporations you want and how many.
start building only one if you do not want more.

the real limitation should be workers.
if you have workers for 3, build 3.

it could result in a loan but more corporations will increase your income and you will be able to pay loans back.

I think that he may have been talking about how when you buy this booster, it triggers for 5 consecutive months no matter what, for up to 15 corporations built in total.

3 corporations in one month can happen, but 15 in 5 almost certainly won't in countries. You rarely have workers available for that. Corporations are larger now as well - so players need less of them.

It would be more useful if you could do it one month at a time. Buy the booster, use it for a month, turn it off, and have 4 months remaining.

I use it for enterprises and there are less issues there. I never use it in my empires.
I don't think this is a critical issue but agree the booster isn't as useful anymore as it was in the past.

The booster allows 3 corporations to be built each month but only if you request 3 corporations to be built.

If no corporations were requested, the booster will not be used.

so if you have 5 such boosters, you can decide when to use them. The unused boosters will be waiting there and will not be lost.

My experience has been that the booster works in 5 consecutive months when you activate it, not just if you have 3 corps ordered.

You can build 15 corporations on one booster, and I struggle to see players building 15 in their countries in just 5 game months.

Regardless - there are other things could use more attention as is.