I agree with all those points, so it is irrational that a chassis Ground to the controls-plate doesn't bother me, LOL!
I guess it's because I know in my ownership it wouldn't be an issue, but I can see how out in the wild, it could go awry for many ender users.
The other thing is those giant Capacitors are such overkill, rated for hundreds of Volts, & we're lucky to get 1 Volt from our instruments.
Also, if any pot comes loose & turns, there's a broken solder joint.