Starfox
Hero
I played DnD 3.0 and Pathfinder each to 20th level - plus 10 mythic levels in Wrath of the Righteous. I played 4E to high levels, somewhere in the mid twenties. Currently at level 10 in 5E. It works, as long as no-one is overly cheesy. None of my players were going for Simulacra or other power options. I tended to double monster hp just to make fights last a little longer, but not much else except in Mythic Pathfinder where martials required me to buff monsters' attack bonus and quadruple hp.
Interestingly enough, we never felt that much of a caster/martial divide even at these levels. Part of this is the above-mentioned lack of cheese, but I am also quite stringent on things like monsters hearing spellcasting. My casters also spent a lot of spell buffing their martials.
Interestingly enough, we never felt that much of a caster/martial divide even at these levels. Part of this is the above-mentioned lack of cheese, but I am also quite stringent on things like monsters hearing spellcasting. My casters also spent a lot of spell buffing their martials.