You're 100% correct the Balmoral takes more care to wear properly, and is open to a much wider range of wearing wrongly.

The Glengarry is more or less two stiff boards so it's going to have the right shape regardless.

In spite of that I do see some pipe band people wearing Glens badly, the usual problem is to have an expanse of exposed forehead with the Glen shoved ludicrously back on the head.