TIL! One more reason to like gov.uk. I had no idea this was a standard but in hindsight it's quite obvious that's the case. I wonder how much of a burden it is at times, and how one can enforce this with automation?
I would say it's only really a burden if you fight it, or don't expect to have to do it and right at the end someone asks "er... does this work without JavaScript?". My attitude is that it's a combination of freeing and a challenge: "we can and should make it simple, even boring"
Automatic enforcement for all services is tricky, because you _can_ depend on JavaScript if the user needs justify it.