Not sure of that logic, they are two different streams, (2022.8 and previous) for feature updates and the other for those qualified with FSD updatesRight. Last I checked, the .17 release was also exclusive to models 3+Y. The theory is that potential new FSD enrollments (by some unknown definition) are just held in 2022.4.5.x in general (with other factors and strategies determining the x) and not getting 2022.8 at this time.
Eg I just went to 2022.8 but have 100% score which achieved while in 2022.4.5, so enrolled and just waiting for Beta. That is why wouldn’t FSD people not get general feature updates as well?