I just changed my preference for dark mode and got a different fingerprint. If it's not resilient to modest changes, it's not really that helpful at tracking anyone. There are already plugins to randomize some header data, so this type of thing has been known and protected against.
If you have past data collected on the users, correlating users despite fingerprint changes should be pretty easy. If the fingerprint itself encodes data and isn't just a cryptographic hash, you don't even need to have past data collected, you just need fingerprints.
It depends on what settings actually change your finger print or not. If only 10% of people use dark mode toggle that's still 90% of users being tracked, which could be worth while.
