As others have mentioned, there's a big gulf between "works well enough that you don't notice the problems very often" and "never fails". Screens work OK in the happy normal path, but as soon as you look into things like DisplayPort chaining and HDMI-CEC you find all sorts of incompatibilities.

> Transistors don't misfire, CPUs don't miss an operation

This relies on a lot of testing. We throw the misfiring ones away at the factory. This may be over half the chips: https://www.pcgamesn.com/amd/zen-2-ryzen-3000-cpu-yield-70-p... (AMD are doing well at 70% pass rate but Intel are throwing away more than half their dies!)

In aerospace or high-alpha-radiation environments, people can use "lockstep" processors (e.g. TI Hercules) that can cope with misfires.