It also doesn't help when you're used to a certain level. And then when you go to other 'places' and even the 'grandmaster' is a P.O.S. you will not accept their 'expertise'.
PS: There are many ways for the same end. And there are ways that are simply useless.
Well, or when the students from that school come to yours! There's a local McDojo TSD chain that we've had a few students transfer from, and oy vey. But I don't think it's TSD in itself that's causing them problems, it's because that chain is terrible and they don't bother to teach good technique.