Earlier quoted context omitted.
Agree with 1,2 and 4. Too much privacy-invading external crap. But they're not really behind. I already got the 1 January Android security update a few days ago on my S23. Considering they need to do testing and possible modifications I don't think this is very slow.
I am still on the 1 November 2023 security update on my AU S22 Ultra.
I wonder if it's your provider being difficult here. The problem with branded (or sometimes even sold with contract) phones is that the carrier wants to meddle in the updates because they're afraid of issues on their network or something. And this can cause huge delays.
I always buy my phones separately, mainly because I hate contracts so I'm on prepay always but having unrestricted updates is another big benefit.