I don't work at Tesla, I just read the numbers. It is strange that CA seems behind as it is usually clearly prioritized, however they did get a lot of the 15.11 updates which is rumored to have the same features and changelog as 16.x but also contains the 80% SUC limit which is currently only relevant to CA due to high Tesla ownership.
Conjecture on my part, no guarantees: they may actually have started to NOT prioritize CA, as reliable canary testing requires statistically relevant sampling of all user groups. This would imply that the world has been getting the update all at once, which makes sense, and it was then halted at the 66% level it is now - worldwide. Given the extraordinary high Tesla ownership in CA having 34% of all users not get the update yet means a relatively huge absolute number there, that also historically isn't used to not getting updates before everyone else. This would explain the large number of complaints from CA without there being an actual anomaly.
Conjecture on my part, no guarantees: they may actually have started to NOT prioritize CA, as reliable canary testing requires statistically relevant sampling of all user groups. This would imply that the world has been getting the update all at once, which makes sense, and it was then halted at the 66% level it is now - worldwide. Given the extraordinary high Tesla ownership in CA having 34% of all users not get the update yet means a relatively huge absolute number there, that also historically isn't used to not getting updates before everyone else. This would explain the large number of complaints from CA without there being an actual anomaly.