It is a sign of a lazy coach in my opinion. I've had small vaulters that vault at higher settings than bigger vaulters. Each vaulter is different. From what I've seen, coaches that require a specific settings aren't coaching to the individual gymnast. They are coaching a skill and apparently only know one setting at which to coach it. I won't say I know everything there is to know about the subject. As soon as I do, I'll stop coaching. I have had some pretty decent vaulters.