I don't have much else to add. You've clearly thought about this topic (WebUSB) more than I have, and I've given people grief in the past for similarly thin arguments slandering Signal over "what if" type scenarios.

In the end I am saying I wish we didn't have things that we already have, which is ultimately pointless anyway. I wish the nature of interacting with a website was much more strictly one directional. I wish it was never considered appropriate for a remote server to learn about or interact with my own requesting hardware. There are a hundred other things I don't want that we have, many much more impactful than this. You seem much more open-minded, and regardless clearly a lot of the rest of the world agrees with you.

Think we just disagree, but I also don't mean to blow WebUSB out of proportion. Plenty worse things for me to get worked up about that also aren't going anywhere.