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My guess is it has something to do with WiFi Calling, which is a major advertising / selling point from T-Mobile.
If someone purchased a T-Mobile phone and it was advertised as WiFi Calling and that feature is broken in an update, you'd have a lot of very unhappy people.
Based on the company I work for now (and those in the past), I would guess the testing team isn't a large team, so they have to prioritize which devices they test and when. T-Mobile carries a lot of devices they have to test updates for.
If you purchase a carrier-free device (I have one currently), the carriers don't particularly have any say on the testing, so if WiFi Calling doesn't work, T-Mobile's only recourse is "Sorry, it's not a T-Mobile phone. We know it worked before, but not now, so you'll have to take it up with the manufacturer."
I really appreciate you posting to our community. I know the waiting game is not anyone's favorite game to play but the truth of the matter is that we want to ensure the update is perfect and does not cause more problems than it is worth. As you can see from other posts in the community, this topic has come up quite frequently and we are definitely aware of the demand, we hear you and it is coming.
Since there is already multiple threads on this topic, I will be locking this thread so that any additional comments can be directed to a single thread.