Good point. You could try submitting a report to @NevilleRay or @TMobileHelp about the congestion on the nearby macro sites?

Sure, but it didn't matter how Sprint's 800 MHz was down there, since we have 1900 MHz LTE on the DAS.  I'd rather my T-Mobile iPhone used the Sprint Legacy 1900 MHz LTE signal that's available down there than the 600 MHz 5G/LTE macro network, which is congested as we share it with a major transit hub in the area.  My phone will hop over to the Sprint signal when it loses the T-Mobile signal entirely, but it's a hard transition to "Roaming," not seamless like the Sprint "keep" sites are around here.

It's still got to be better than Sprint's 800 MHz was, right? 🙂 At some point that DAS will have to be accounted for by the T-Mobile Network Folks. It's probably on some list somewhere with a plan to either upgrade it or shut it down.