Considering (relative to now) cookies were added
really early on... it would have made sense to have a user/browser token that was only available to a single site, with a reset option.
Another thing that's a little irksome is that nobody uses http auth, because there's no easy logout option.
I will say I do like parts of http/2 being there... I think that dnssec + tls should have been part of the official mix. At the very least CA pricing has fallen into a reasonable range (about $10/month) for wildcard certs. Another thing that took too long is SNI.
Overall though, I think people have gotten pretty spoiled when it comes to technology (myself included)... OMG it takes a whole second and a half between clicking login and being able to see my bank statement. I remember when it was 15-seconds... I think everyone should experience a modem ANSI interface at 9600bps... (not just because I still like BBSes and ANSI art).