CapnZapp
Legend
I don't think you are prepared to argue giving a character their proficiency bonus as a minimum for saves (just to give one example) breaks compatibility anywhere, even a little.given how well 5e is selling, you either get tweaks to it that remain compatible, or nothing. You will certainly not get a new edition. So far we always got new editions when the previous one was no longer selling well.
Assuming I'm correct we should be able to agree to drop your line of thought as quietly as possible.