

Good catch. Still, doesn’t make it true either: it’s not such a “fundamental use case” that it would even require the capability. The browser already reports the usable information in the user agent (you rarely even in that 1% need more specificity than “Windows” on “Desktop Intel”).
Platform.
Optional.
It’s on us (all of us).
Apparently.
Posting media.
Fediverse.
Yes.