What I said may not be a true for everyone or anyone. This is all just speculation since Tesla does not disclose how they choose who gets what versions. So far the only people who are on somewhat predictable update cycles are the FSD Beta testers. They get updates every 2(ish) weeks.I took delivery of my 2021 M3P in September. It came with 2021.11.103. It took quite some time but it finally updated to 2021.36.5.5 on 10/28.
I don't have FSD and have not seen any additional updates.
You may be held back for a completely different reason then I hypothesized... Or maybe it's completely random and I'm drawing conclusions that are not accurate based on my fairly small sample size of data. Only Tesla knows for sure and they have not been forthcoming with information regarding their vehicle update processes or logic.