Just a data point to share about flights crediting. I was able to add my BluChip number during the booking process on 14-December for a flight that I completed yesterday (27-Dec-2024). The FF# was printed on my boarding pass when I checked in and I received an automated email that the points were credited to my account within 3 hours of the flight landing. I also noticed that the activity page on the website shows "promised" points (basically upcoming flights yet to be flown) and that is also accurate based on flights I have booked and input the number.

Also sharing as a secondary data point, I had noticed previously that my birthday was prefilling incorrectly when trying to use a saved profile when logged in. I noticed yesterday when doing a future booking that this bug seems to be fixed now and my birthday is now populating correctly..