I appreciate you're not debating the point, but just for the sake of example, during those two Betas, I had a set of work circumstances that meant having very limited free time. I imagine I'm not the only one, and then what does one do with the limited time available? Download and play-test a set of new software that may or may not be enjoyable, looking out for bugs, with maybe the admin of taking notes and writing bug reports, or spend time getting away from the PC for an hour before bed? Maybe with a glass of something pleasant
I don't think it helped much that the beta was specifically positioned as "Fleet Carriers"; if one didn't have any interest or ability to own an FC*, it didn't look like there was anything in the beta to check out anyway. I know that there were some quiet additions, like the UI changes, but I think one could be forgiven for not knowing they were in it in amongst the FC related discussions.
I don't think highlighting pain points is invalid, either during or post-patch, regardless of whether the beta was played. It also seems like there are a number of bugs that no one in the beta noted anyway, e.g the ring hotspots not highlighting, surface installations missing, tourist beacons vanishing
Though they may not have been there during the beta, to be fair - it's possible that was all introduced as part of the live build process, but who knows
*There should be another abbreviation for them really. I can't help re-reading that and thinking it looks like I'm talking about the ability to own a football club, which unless one is Elton John or Roman Abramovich, is highly unlikely