I'd say the opposite - it takes a quick wipe with a cloth to clean off the day's muck ready for the next day. If TOCs aren't even doing that then they're at fault there. The muck is still there if it's moquette, it's just ground in.
Ryanair go for full leather because it's easy, quick and therefore cheap to clean. Not sure I'd go full leather, though, as I find it gets sticky when warm.
Ryanair don't have leather, they have pleather.
But I also rather like leather seats, as long as the coverings aren't so thick that they make the seat feel smaller. I love those on the IC225s, but on the former Avanti Voyagers, I feel that adding them made the seat feel tighter and less roomy. And you can tell it's not real leather on those, so they appear plasticky and cheap.
No no no.
I can't be doing with sliding around on leather seats.
Trains should be a dignified and tasteful way to travel. Leave the leatherette to the boy racers.
You don't slide around on them, and if done correctly and using decent leather they
are tasteful. Take British Airways for example. Their Pinnacle seats look very smart, I think, far more so than their long haul stuff in moquette. And I think the ECML leather first class looked (and still does) far more tasteful than the Azuma moquette seats. Same goes for GWR HST (and current ScotRail) first class.
However, cheap jobs like SWR First Class and Ryanair pleather DO look cheap and tacky.
I found the leather seats in first class on GWR's HST fleet extremely uncomfortable
That's more to do with the padding beneath the thin layer of leather, I think. As I also found them hard, but not the VTEC ones.