As someone who has avidly been reading manuals since the early 90s, car manuals have always been pretty good. Home audio/video equipment has also had great manuals over the years too. I don’t recall a time these turned to shit.

Motherboards / BIOS documentation comes in dead last, and has always been shit. Dozens and dozens of proprietary settings that are not described by the manual nor the built in help, and there’s only conjecture online. At least now the English is mostly correct, but they’re still very bad at describing what niche settings do.