I notice a (small) difference
Probably an important factor, small things really piss me off on the Road, my MTB can be hanging together by a thread with a saddle made of proqupine quills, and it not matter. I’m on my 4th saddle, 2nd bar tape*, and just ordered a different front mech as the current one doesn’t quite shift how I’d like (despite the fact I probably only shift once or twice in a ride!).
The slop (and numb toes) of MTB cleats peeves me off on the road bike. and for road biking to be fun the bike needs to be almost unnoticable IMO so you can get on with the serious business of pain/admiring the view/pain/thinking about cake.
*soon to be third, DSP seems to have lost it’s cushioning and started to peel off.