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I'm not too familiar with the technique; doesn't pixel tracking still require JS to derive more info from the visitor beyond just their IP address?

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The GET request will generally also include the User Agent, and any forwarded headers. This can include cookies.

Yes but that doesn't include things like screen size/ratio or some other key metrics that usability people rely on.

I can see the need for JS but it would be nice if they offered a pixel only version with less granularity for those of us who want the data but without JS.

Those things violate the privacy-first principles, do they not? Things like screen size/ratio are very strong fingerprints that can be used to de-anonymise users with ease.

Exactly! I think most people don't realize the problem of browsing web with JS turned on.

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