I would always lose something I care deeply about: world integrity, to gain something I care nothing about: someone minmaxing a character.

It's therefore a fallacy to claim your proposal "costs me nothing". Or anyone else against it, nothing. One may as well propose removing all class restrictions preventing magic users to pick and swap spells, because you see... my character has that backstory. You just stick with standard cleric spells! (Result: killing much of multiclassing for convenience).

There is a point where a wild west of internal logic starts to feel grating. We disagree where that point is. Nonetheless, when rules become suggestions, depth is exchanged for convenience. Sometimes, that is necessary because of technological limitations. On the matter of becoming op quicker, that's... not a "feature" of any type added to the game in my book. It's just something that takes away and gives nothing back.