2024.3.25 has both old time "testers" as well as some others who opted in to FSD more recently. It was an FSD for anyone version, not a tester only version. Many of the non-testers on that version have already been updated to 2024.14.x, but some have not yet.
Tesla does not tell us who is or is not in the tester group. Looking at the entire history of updates, it appears that they stopped adding testers back when FSD was offered to averyone, in May of 2023 and with version 2023.12.10 (FSDβ 11.3.6). Prior to that, the FSD code was included only in updates of the tester cars, but after that point, all the main updates included the FSD code. However, releases which went only to testers continued. If you have been subscribed to TeslaFi all along, you can look up your own update history - if your first update which included FSD was after 5/22/2023, you are probably not in the tester group.
This matters because testers in this thread have a very different perspective on FSD than new FSD users. Testers have spent years noticing and reporting every glitch and foible in FSD, some of which persist in the current FSD 12.3.6 version. They tend to consider flaws to include any behavior which they could do better, or which they choose to intervene or disengage. Many reports relate to the driver or passenger comfort level, for example spending too long at stop signs.
It also matters because the testers have had updates to FSD 12.x since February, and 12.3.6 since April. They are ready to start reviewing something new. But it is likely that main branch folks will have to wait a while. So the tester discussions here differ vastly from the concerns of newer FSD and V12.3.6 users.