A little OT but the conversion for wear-and-tear on parts is not directly proportional to perceived effort. To wit:

I replace components on my gravel bike 3-4x as often as on my road bike. Some things (like rims) I have *never* replaced on a road bike, but I ended up wearing through the brake tracks on a set of TB-14s in about 2 years.

I'm not sure if this is more or less than I would replace parts on a MTB because I rarely ride MTB enough to wear things out.