[eyelidlessness]

You might be pretty disappointed by the defaults in many cases: it’s extremely common to start with styles for the smallest viewports (“mobile”) and use media queries to add larger viewport variants. I don’t know if you’re among the same people who complain about the overuse of mobile UI techniques on larger screens/devices, but that’s almost certainly what you’d get more of in general.

[persnickety]

One way around it is to do what the Tor Browser does: report an arbitrary value.