This idea of dnd balance is not the design intent. Balance in 5e is actually very flexible. That’s why you have groups destroying encounters way over their power level and others dying to easy encounters.
The problem is not that 5e is hard to balance, the problem is that you are looking for a very tight balance that 5e cannot provide, for many reasons (stats, spells, the adventuring day, and several others).
This idea of dnd balance is not the design intent. Balance in 5e is actually very flexible. That’s why you have groups destroying encounters way over their power level and others dying to easy encounters.
The problem is not that 5e is hard to balance, the problem is that you are looking for a very tight balance that 5e cannot provide, for many reasons (stats, spells, the adventuring day, and several others).