[maples37]

The key difference here, though, is that all of those electronics are integrated into, and do not break the path of, the absolutely-must-work hydraulic path.

Throttle-by-wire is a different beast entirely. If you step on the gas and don't go, that's usually very annoying, and depending on circumstances could be dangerous. But if you step on the brakes and don't stop, that's pretty much a guaranteed wreck right there.

[yencabulator]

ABS does break that path. And then because it's decreasing pressure it now has to have an electric pump to bring it back up.