Was the WebUSB finally fixed?
In recent Opera versions I had the problem that in the WebUSB window my phone showed up but there was no confirmation button (select device and confirm) what makes it useless.
I had to install Chrome to use WebUSB.
Another Issue was in Settings page, hovering or moving mouse causes an flashing of background color (dark mode).
I mean if you move the mouse over diffrent areas of setting page the background color was changing a bit, if you look close its very obvious.
Hope its fixed now, havent install it so far.