[rypskar]

>> Why anyone would ever willingly do so is still beyond me

Some games had animations based on frames, not time between frames. So they where unplayable without reducing frequency

[p_l]

One day I switched off turbo while playing Test Drive 3.

Suddenly, I didn't need superhuman reflexes to play, and could drive on curves at speed :-D

[haser_au]

From my very vague memory, Reader Rabbit was one such game that was unplayable at a higher CPU frequency.