https://mozilla.github.io/standards-positions/#webusb
https://news.ycombinator.com/item?id=34564119
https://nullrequest.com/posts/thecaseagainstwebusb
and on and on...
No improvment to the spec can fix users.
Personally, I think choice is great. Why be upset when you can download chromium (it is supported by pretty much any platform FF is) and use it to do all sorts of stuff with WebUSB, if you are into that?
Still, I would like to see FF disable these features by default and allow opt-in. I don't see a great reason to avoid implementing them behind some "wall" (other than to avoid an increase in a concealed attack surface).
This is the same a surgeon saying they refused to perform life-saving surgery on you because they don't believe you understand the consequences of the possibility of dying in surgery.
The average person cannot be an expert on surgery or on browser security it's up to the people that have the education and work experience in there to make those decisions and handle them. Mozilla as another poster said has taken their toys home because they didn't get what they want.
What a bunch of idiots. They seem to have a completely misguided concept of what a browser is. They still have a 1990s mindset of the browser being a window into the Internet, instead of the universal UI that it has become today.