Cater to scrubs, at least a bit

For those who outskill the bosses, great - this isn't for you.

For those who need to overlevel/overgear for their boss fights, this is.

Farming/leveling areas need to be bigger (more mob groups) or more rewarding (xp diminishing returns less harsh) in some way.

I was almost going to suggest that there should be a separate mode to allow continuation on boss fights (eg. different ladders) but I realised I don't want that for the longevity of the game. However, there needs to be some balance for those of us who need to be a bit more powerful to approach these souls-like boss encounters. On to my idea:

Imagine a side area on each map separated from the main, intended, route. You could have level scaled mobs there. No one needs to go there unless they need to farm a bit. Currently the interstitial areas seem too small and/or the time between bosses too short.

Eventually players will need these areas less and less as they get better (or gud as some may say).