Let’s hit your analogy from earlier.
Ask the Chef what happens when you have a finished recipe (1.12) and you go back and take things from previous iterations of that recipe (1.5 AV). Frankenpatching Classic together doesn’t create a completely authentic experience, yet no-changers are foolishly on-board with this principal.
Change the amount of flour in your Classic Pancake recipe and you end up with a Crêpe.