First off, the wire control systems in aircraft are absolutely reliable, in part, yes, because of the backups and redundancies. I figured I didn't need to say that.
Because the cybertruck is much worse than you know, based on what you wrote about things going wrong.
You know how sane design has different systems with their own cable bundles, so that if one bundle is damaged, you lose that system, not Everything dead?
Well the Cybertruck puts everything in one singular bundle. If that gets damaged, everything electronic dies. Which can include your backup mirror.
In short: wire control systems, with redundancies, great, long overdue. Cybertruck pos.