Yes, I've encountered them. It seems really hard to do them in a way that doesn't touch heavily on style. To the extent that the preferred solution to trying to shift the focus back to deeper issues is to go one step further and mandate auto-formatting tools. So individuality-of-style has been dismissed out of hand.

Can they be helpful? In some cases, perhaps yes. But they're definitely pushing a collective-ownership, try-to-smooth-away-individual-differences agenda.