"Is this really important given that supercookies can almost always persist between sessions and across domains?"
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If you want to fix a problem, there are going to be points during that process where the problem is partially fixed. This only becomes an issue if we're headed in the wrong direction, or focusing on a sub-problem that would be better addressed in a different way, or if we have no plans to fix the other attack vectors.
But the steps we'll take to attack fingerprinting are very similar to the steps we'll take to attack supercookies, so there's no harm in grabbing the low-hanging fruit first.
Supercookies clearly have some value to advertisers and other bad actors or else they wouldn't be used. There's value in closing off that specific tracking method while we continue to try and figure out the harder problem of how to standardize headers, resource loading, etc...
People shouldn't think that this change on its own means they can't be tracked any more, but also this change is worth celebrating -- not all sites use fingerprinting (yet).
But yeah, we still have a ways to go. Small steps.
"Firefox 85 Cracks Down on Fingerprinting"
"Is this really important given that supercookies can almost always persist between sessions and across domains?"
----
If you want to fix a problem, there are going to be points during that process where the problem is partially fixed. This only becomes an issue if we're headed in the wrong direction, or focusing on a sub-problem that would be better addressed in a different way, or if we have no plans to fix the other attack vectors.
But the steps we'll take to attack fingerprinting are very similar to the steps we'll take to attack supercookies, so there's no harm in grabbing the low-hanging fruit first.
Supercookies clearly have some value to advertisers and other bad actors or else they wouldn't be used. There's value in closing off that specific tracking method while we continue to try and figure out the harder problem of how to standardize headers, resource loading, etc...