In addition to that, for popular, “name brand” mice, there are often also tons of replacement parts available from China. You can basically re-build the complete mouse from parts.
Otherwise, as you’ve said, switches, wheel, the battery and maybe the cable, should always be replaceable (as long as you can solder).
You still had the rubberized grips on a lot of mice back in the day, that would just get sticky over time or get rubbed off. Not really much better.