Getting fed up...

Manufacturing engineer here. ISO9000 is meant to stop certain quality issues by making sure you have how to make your parts written down and the directions are followed. This can help mitigate situations like "Bob just quit and he's the only one who knew how to make this". But even with directions, some operations take practice. And as others have noted, if you want to cut corners, ISO9000 can be used to make sure you consistently cut the same corners.

Likewise, statistical process control is a tool that can be effective on some problems but not others. A few precise measurements of cylinder bores plus some math can help you spot if the boring bar is wearing out long before you would find it checking every bore with go / no go gauges. But if you're building devices that need individual calibration, or a device either works or doesn't with no in between state, this won't get around checking individual parts.