To my view, the CL is a public area akin to a hotel restaurant...not an extension of the guest room, and I think it's appropriate for the hotel to have an expectation that guests dress as they would in the restaurant. And enforce it.

That said, bathrobes in the CL don't bother me personally as much as the occasional inconsiderate knuckleheads who show up grossly sweaty and smelly after a session in the fitness center.

Shower and dress first, please!

The bathrobe slobs are also preferable to me than parents who show up with poorly-behaved and/or unsupervised children. (I don't have a problem with kids of ANY age in the CL as long as they're well-behaved and supervised).