We can argue over how they should be accessible. Mozilla came out swinging for the perspective that they shouldn't be part of the web at all.
There's a lot of ya'll with poisonous rotten shit running through your veins. Thank you for at least speaking up, not just silently being part of the muting silencing horror. But it's still a vicious shitty crypto-native ardency that believes the web should always have it's wings clipped. That's the vicious force at bay here. It's a toxic mentality. It was here too. It had no regard, no middle ground, nothing but the same utterly uncompromising anti-web charge that Safari had begat mere days before.
These words are now mute, since I have indeed been voted under with anti-web zeal. What a sad lot these shallow anti-web foes are.
The rest of these sound like extra bits of fingerprintable entropy here and there. Like, in no way will a website knowing how much RAM I have will improve my experience, but it'll help add a few bits of data to my web advertising fingerprints. Magnetometers and battery status would absolutely be fingerprintable; individual device characteristics would be unavoidably measurable.
The page you linked to actually lists all this out, and that should be enough to convince you that these standards shouldn't be implemented.