This is the issue with D&D, and likely any game that strives to be the 'kleenex' of RPGs.
There is no possible way to 'balance' the game around
1. True Casuals.
2. Total RPG Theatre Kids who dont care at all about being effective.
3. Min-Max, Multiclass Dipping, Rules Lawyer Power Gamers.
Now, those may not all be at the same table, but if the game allows for all 3 to exist, and more besides, no way can it possibly be 'balanced' for all 3.
Instead, it all falls on the DM to balance the table, and encounters, but then Wizards doesnt even give you the rules for monster creation...oops.