It is a reason that they don’t want your money to offer this feature, that you disagree with being the reason.
That is not entirely correct, the last free transfers occured this year late April which is 3-4 months ago~ which actually caused the realm population issues due very high popularity.
The developers explain a bit about the realm population controls in the same post too below. You understand already that there are serious consequences and that it will likely get worse.
Then the subsequent problem that came after that is this:
Pending a full merge and other finishing moves later this year.
Edit: If you have further feedback you may also submit it through the ingame box. It is unlikely they will do anything until they finish the planned mergers though.