you may be right about it T-Mobile taking extra time, but don't be negative...
it's true that they take the longest due to the fact that they bake in their bloat ware before releasing anything to the wild... but given all the issues that I've read about re: A11/OneUI3, that might be a good thing. the reason they take so long is because after they bake in the garbage, they test the release extensively, and in so doing, reduce the problems that users like us have to deal with.
in the long run, since I'm on the note 10 plus, this will probably be the last update I receive, and since Samsung is allowing ads in native apps now, it will probably also be the last Samsung I buy...so I'd like it to work right for the long time I have this device
