That's not a stupid question at all. I learned a lot about car leather by reading the free pamphlet that colorplus will send you if you email them. Turns out that leather upholstery has a coating on top of the actual leather and this is the stuff that eventually may wear away at stress points. When you look at it, it looks like the leather is being abraded, but in most cases it's just the superficial coating that's gone south.
On mine, the side bolster (that's the official name of the padded part of the seat that surrounds your flanks and is intended to keep you from sliding laterally when you go around a curve) continues to wear away the coating, and once or twice a year I touch it up with colorplus leather dye. It really looks like new, at least for a few months, and it's really easy to apply.