> Background location, biometrics, device identity, boot triggers — none of that is available through a browser
Most browsers do in fact offer that level of granularity, especially for PWA usecases [0].
And from an indicators perspective, having certain capabilities turned off can make it easier to identify and de-anonymize individuals.
[0] - https://pwascore.com/
Fingerprint? Yeah. Deanonymize? No.
There's a considerable difference. And doing whatever one can to mitigate the former shouldn't be discouraged by falsely equivocating the latter.