I think your 2, 2b, and 3 are absolutely spot on, and it is amazing the extent to which web developers go out of their way not to do these things. I'm going to

I think your 2, 2b, and 3 are absolutely spot on, and it is amazing the extent to which web developers go out of their way not to do these things. I'm going to slightly disagree with 1, though. It's somewhat important now, but should become less so as http2 gets more widely used.