Here is a new post at EconLog in which Bryan Caplan discusses how signalling contributes to the status quo bias.
The lesson: In the real world, signaling naturally tends to ossify behavior - to lock in whatever the status quo happens to be. If you're an optimist, you can protest, "It's only a tendency." But even an optimist should admit that this tendency leads to atypically slow and unreliable progress.
I still think expectations of conformity are largely cultural. "Different cultures demand conformity in different ways" is a compatible assertion. It would be interesting if total conformity demands tend to sum to the same number across cultures, but that seems really unlikely to me.