I've swapped the seat over before it happens to give even wear, and i take care to hit the correct part of the seat with my landing gear as i enter the car. Both seats are in excellent fettle for 7 years old.
How many cars have hou had where the drivers seat has done maybe 100k and the passengers seat has done maybe 10k ..so to speak
What about the seat belt guide? Does the other side of the seat have a captive nut for the seat belt guide fixing bolt? How did you cover the hole in the leather?
Do you have reclining seats? There doesn’t look as though there is enough space for the adjuster levers.