Could you elaborate? It seems like it would be trivially easy, like something that could be implemented before noon on a Friday. Like less than ten lines of code with a conditional statement to generate the warning message. What am I missing?
This isn't a "we can solve this in code" thing but a "how do we make sure paying players aren't shut out of the game because they didn't update?" sort of thing.
Not every version of the game is always able to be "up to date", like the Switch version, so some form of backwards compatibility has to be available.