Got Switchbalde and yes it's heavy. I remove jaw part for going uphill to save weight, and sometimes remove full helmet going up as too hot. Downhill OK but in UK so rarely over 20C. My rides are a long up, followed by long down, if more of a mixture then changing would be annoying.
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Energy absorbed by brakes is same potential energy in both cases. However if speed climbs before breaking the descent is shorter time so energy absorbed in less time, so brake reaches a higher temperature albeit for a shorter time. Generally degradation depends exponentially on temperature and...
I bought a wheel and tyre with an insert. It was hard enough getting tyre off and gave up refitting, figuring that is I ever had a tyre gash that needed an inner tube I wouldn't want that wrestle with the tyre insert in the wild.
I read Bosch warranty batteries hold 70%+ of power after 500 charges, and if well looked after should be more like 1,500 charges. I've done about 200 charges (after down to 40% average), 3,000 miles and feels like getting 90% of power I used to.
Last few times I simply removed valve core, sprayed tyre and rims with dilute detergent and pumped like mad with an ordinary foot pump. Tyre rims popped on then I remove pump so deflates, add gunk then valve core and reflate. Removing valve core on first inflation is key with detergent...
Got Switchblade and most rides are to top of mountain and put chin guard on for down. Hard to add guard without removing helmet. In Welsh summer I remove on climbs as too hot, ok on flat and down, but think other helmets would be too. Feels solid, some might call heavy.