Chunky would have bought you mindshare, something that would have been way more important than cpu/system performance.
The thinking was "you can't to Wolfenstein on Amiga because it doesn't have chunky" - which is of course bollox, but any kind of 3D on the Amiga at that time was (AFAIK) centered around doing blitter or bitmanipulation directly when drawing the screen, and not adding an extra step with a chunky buffer you convert to planar later.
A 68000 or 68020 is relatively slow, but pc games typically just let you set what size the view should have if you thought it was running too slow (i.e. scale it down), and so you can of course do on any computer.
By the time 'everyone' used c2p the train had left the station.
(And it typically adds 1 frame extra per update so it is a bit disadvantaged, but you can live with that.)
