as there are more parallels to that conclusion than one could draw to say, a laboratory equipment. While it may not seem so, both schools of thought are useful.There is a general sort of things to do to every cicruit, good grounding scheme for instance that can be carried from project to project. The details of what constitutes a good grounding scheme are easier to quantify as a whole...the amp is quiet. Just like any other part of the circuit design, there are a lot of ways to get there.
cheers,
Douglas