Everything you say is true, and I agree that it's a great tool. I'd never tell someone NOT to use it, I just like to point out that it's not critical, because a lot of people - especially newbies - can get something stuck in their heads that can get them upset over nothing.

A good example of this is prop balancing. I can't tell you how many times I have heard of a newbie who has been waiting to fly his plane, but his prop balancer hasn't arrived and he thinks that he can't fly his plane because he hasn't balanced his Master Airscrew 10x7 prop.