Cause obviously a rogue/paladin with negative charisma and strength is very broken
Well, honestly that was my first and one houserule, doing away with multiclass stat requirements. They were put only to placate people who are actively against multiclassing. Cause obviously a rogue/paladin with negative charisma and strength is very broken
For what it's worth, I wouldn't let temporary bonuses/abilities to qualify for anything permanent, ever.
That's just going to open a can of worms if you do, because temporary stuff is by definition going to change, and then you'll be left with questions about the validity of what you're left with, or possibly even stuff that just can't work anymore without the original requirement.
That said, those requirements are a pointless and nearly useless addition to the game, so if you have players who start looking for shortcuts to bypass the requirements, consider how much they really add to your game. If you think they are useful, enforce them and don't let temporary bonuses bypass them, if you think they are useless, ignore them altogether.
But also, it's there to prevent certain dipping where you pick a class for a certain feature that by itself doesn't need that class' "prime requisite".
It does, bizarrely, prevent an otherwise perfectly effective dex based paladin from multiclassing.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.