Yes, absolutely. And a GM that can do that is definitely the GM that I want to find and play with.
But doing that kind of campaign balancing is not an easy task. Especially for new GMs.
If anyone can come up with a magic mechanic that would allow a new GM to easily create a balanced campaign with an unbalanced player party, that would be ideal.
So you want a game where everyone is balanced - sorry but I find that boring. People aren't balanced in the real world everyone is good at some things and bad at others that's what make life interesting -same with a game. It seem people want a video game where they can have pve or pvp and it all works with no real input from gm. D&D was about a PARTY. Yes the mage did great at killing lots of little guy but sucker at the boss and could fight 1 maybe 2 battles in a day. The Rogue was the opposite ie could do his stuff all day and was great vs bosses but sucker versus minions. The cleric hkept everyone alive and acted as a backup fighter and t uu e fighter kept it all together because he could fight all day every day. Balance without being Balanced.