Only because we regularly service them by replacing bushings, CV joints and ball joints regularly. And shock absorber failures are still commonplace.
> EVs aren't that much heavier
They're much heavier. It's obviously hard to make a direct comparison because there's no such thing as "equivalent but with an ICE engine" but a Golf E weighs about 250kg more than a Golf GTI.
> there are plenty of crazy heavy ICE vehicles that work without issue
And they have heavier duty components which require more servicing and are more expensive to replace.
> None of those costs matter, compared to ICE.
Can you show me some evidence for this? I am not making the claim that EVs are more expensive to maintain than ICE cars, but you made the claim that wear and tear costs (aka maintenance costs) on EVs are "negligible". You will need to show some receipts for a claim like that.
For an apples to oranges comparison, a Tesla Model 3 is 3,648 to 4,250 lbs; a Honda Accord is 3,150 to 3,430 lbs. Totally difference cars, but same-ish external size class. Those battery packs are heavy!
Personally I'd call 10% tiny.
Also you save a third of that when you remove the driver.
Tire wear may increase, but a robotaxi can also optimize driving style to reduce it.
None of those costs matter, compared to ICE. EVs just have less things that can break, and even less things that result in EOL or catastrophic failure. The more miles a taxi runs for, the more money it makes. Even if costs increased, the profit would easily make up for it.