[lxgr]

Let's please not (or at most, add a scary warning for non-tagged devices), as this would break the use case for at least all retrocomputing.

[ACCount37]

Aren't most retrocomputing USB devices running open source firmware? Adding a descriptor "WebUSB supported" is a few commits and a firmware update away.

[oofdere]

that's not going to work for use cases like the https://webmd.pro where you're interfacing with hardware from other manufacturers

[SpecialistK]

https://github.com/asivery/webminidisc

web.minidisc.wiki is the "official" version - lots of clones around.

[lxgr]

Definitely not most MiniDisc players. I doubt mine even has updatable firmware!

This probably applies to many older (or even newer) USB devices as well.