I find that the concept of “long rest” and “short rests” can pretty much solve the power gap between many classes, such as monk or warlock. If you take “short rest” abilities and make them “long rest” by multiplying their amount of uses by three, it balances itself pretty much...
but fictionally as well. The rules explained what it meant to prepare spells and why spells that a wizard wanted to cast twice had to be prepared twice. It explained what spell components were for. And it explained