Interesting that fixing "how to center a div" is considered harmful, but WebSerialPort is actually very good?
> The result: there is now effectively one dominating web browser run by an ad company who nigh unto controls the spec for the web itself
I don't think this this reality. Google proposes a bunch of APIs that goes nowhere because the other browser vendors consider them harmful. Google's previous attempts at trying to drive more adtech into the browser have failed due to a lack of support from other browser vendors.
I think "who drives the web specs" is probably in the best situation possible. It's largely Google, Mozilla, and Apple who all have slightly different interests in what makes a good web platform, and the web ends up better for it.