Spring is made I guess with a glass filled nylon, probably 30% glass by volume, as that is a pretty common material, and is quite robust and resilient. however for a decent spring that arm should have been thinner, plus the nylon should have been non filled, which would mean they would have had to use 2 moulds to make the outer knob and shaft in a 30% glass filled nylon for robustness, and then the inner spring section as a slip on collar that would have the flex required to survive long term operation as a spring material. In that case I would guess the lifetime would be well past the 50k cycle life, and the wear on the end sections of the spring in the detents would also be a lot less.
Would prefer though that the manufacturers used a thicker gold plate on the switches, along with a thicker gold plate ( or a welded on German silver contact pad) on the wipers, so that the operational lifetime would be longer. However that would require a selective plate on the board, or for them to use a small daughter board that has the contact pads on there, with a set of mousebites or pins to allow the 2 boards to be connected. Might be doable, thin PCB material with double sided etch, lots of small vias and a heavy gold plate, plus plated milled vias on the edges for soldering to the main board, and some solder pins to both locate and carry current. Main board would just need a thin precut insulator to prevent arcing over between traces, and would be cheaper than a bespoke switch, plus frees up board space to route traces on the front and components on the rear of the switch as well.