Okay, so in a car with vacuum assist, you have full braking power for several applications of the brake. Once the vacuum in the servo is exhausted, the brakes still work but will need a much harder press on the pedal. If the brakes become hard to use the second the engine is off, your brakes are fucked and you need to get the servo and master cylinder replaced.

Many really modern cars have gone back to the old WABCO-style electric pump that will pressurise the braking system as long as there's power in the battery, because that whole thing plays more nicely with hybrid drivetrains.

Until now you said that no car has power brakes, now you’re saying well they do have power brakes but they keep working when the power’s gone. I really don’t understand why you’re arguing with me.

But it is all beside the point. It’s easy to point out problems with BEVs because they’re new, but ICEs are far more mechanically complex and are therefore also subject to many kinds of failures. Simply because they have fewer moving parts, complete loss of power in a BEV is far less likely than in an ICE. This is why I said that we shouldn’t be overly nostalgic for ICEs.

Perhaps you’re just overly focussed on my throwaway line about “blowing a belt” - ICEs can also fail from a damaged cam, valve, pushrod, crankshaft, distributor, piston, timing chain, injector, air intake, turbo, fuel pump… I’m not really sure what your point is other than to nitpick at my example of one of the literally dozens of complete power failure modes of an ICE.