As for the mechanicals, is just that they ride the bikes so much harder? Chains snapping under too much power, riders getting quite a few flats? I know I ride like a pussy, but I’ve not had a puncture for about 18 months!
Not sure it’s possible to snap a chain under too much power, if the chain is in good order? Just on the basis that a pro track lead-off man or a road sprinter can put 1500W+ through a chain, with violent acceleration, and it’s fine.
I think it can only snap if it’s deteriorated, like a rough shift has slightly bent a plate and caused a weak spot, and it’s prob hard for the mechanic to spot.