sorry, I thought it was a well known thing here given the various discussions over past year or so https://groups.google.com/a/chromium.org/g/blink-dev/c/-2JIR...

on edit: so I'm thinking as there will only be one UA floating around then, sure, older UAs can exist, but those become progressively more suspicious.

I mean I realize it probably isn't a problematic, just wondering, but on the other hand it shouldn't be so difficult to follow the reasoning based on the context I would think:

poster says - in order to be able to scrape effectively you should appear to be a real human, use different UAs etc.

So as this change happens different UAs become one less thing that you can easily change to seem less suspicious, as a non-frozen UA would then be a suspicious sign after some time.

So a sort of side effect.

The switch from UA to browser fingerprinting makes it harder to scrape without being stopped.

Yes, at any time the UA could be ignored and clients could be fingerprinted, but now the UA is being made next to useless, so fingerprinting will now become the default everywhere.