A series hybrid is useless without a battery, while a parallel hybrid is not. Nonetheless this is a strawman argument, as the issue was not about having no battery. A parallel hybrid can function fine with a fairly highly degraded battery, but an EV with similarly battery degradation would become pretty useless. Do you know of anyone who has replaced the batteries in a hybrid?
Once the battery is degraded, then all the other systems of the EV - brakes, suspension, body, interior, etc, can be perfectly fine but the car is of no value because it has no range. And the cost of fixing that is prohibitive so the vehicle is disposed of.
Batteries have a finite lifetime (actually it degrades over time depending on the chemistry), but cannot be economically replaced like other parts. I place as much stock in Tesla's battery life claims as I do in everything else Musk says. My dad has a hybrid and an EV, and the batteries are noticeably degrading.
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