Yes, higher level is where things tend to fall apart both in 5e and 3.X. 5E has its own problems at high level. High level 3.x turns into rocket tag with any competent and well-equipped party, but I find low-mid level is a good balance in that edition between power, player agency, challenge, and complexity that really shows the strengths of 3e.
I'd say that 3e is definitely better suited to crpgs than 5e though. Computers can easily juggle all that 'bookkeeping' that scares people away, but on the other end we see Larian here is resorting to heaps of homebrew rules and additions to try and keep BG III's combat fresh (YMMV how successful they have been)
