I don't understand why we need to trade here. Just block figerprinting and do not provide any alternatives for advertisers. This is the best for users.
The idea is that if sites that query fonts, engage canvas, read the user agent information, etc, they are likely trying to build a fingerprint, so the browser will start to return generic data.
Presumably - hopefully - it would allow users to set their own privacy budgets. Even better if it supports granular per-site control, which may be needed for certain specialized websites.
Many of those features are not so useful and their main use is fingerprinting, for example:
- WebGL is mostly used for fingerprinting
- enumerating installed fonts is mostly used for fingerprinting
They should be put behind a permission popup, so that only those sites that really need them (e.g. graphic editors, text editors) can use them. So nothing gets broken.