>It's just the first layer and there are multiple layers underneath this that we don't know about.

Oh, of course. I am sure this is the tip of an iceberg of tons of server-side detections and analytics. But, still, the client-side portion could've been done more cleverly.

What I meant was "some of the specific things in this little client-only snippet could've stayed server-only". I am sure long before they added this they already had tons of other mostly-server-side detection coverage.