FWIW there are a few Canon lenses that don't even have focus motors in them

...the TS-E lenses are manual focus only IIRC.

Then there's the (wonderful IMO) MP-E which doesn't really have manual focus either...you just move the whole camera and lens to focus.

Fair enough my 24/2.8 doesn't do the auto/manual focus thing but I'm struggling to think of a time I've used the AF on that lens so it doesn't bother me in the slightest

It's mostly the "budget" Canon lenses that have cheaper AF motors that don't have full time manual focus available.