I think nobody cares. They all use metrics like speed, CPU usage, and ACID[x] to test the "quality" of their browsers. That's why you haven't seen browser UI change very much and why quality of life features are never addressed. The only reason we got built
in web-search boxes was the HUGE amount of money to be made.
Well how many actually print to dead trees these days??
Although that is a huge complaint I do have about HTML5.