Oh, I perfectly get that you're willing to pay more for more blanket coverage. My point is simply that for the majority of use cases, the advantages of a larger network do not apply. If you want more assurance of coverage no matter where you go, that's your call.
My original post simply answered your questioning of "fact" that most people at any given time are not far from where they live. And most people live in within the metro areas where TMo does not have significant coverage gaps.
No one's trying to convince you to switch, but when you use terms like "stuck once you enter into an agreement" and "probable non-existent service" you're no longer working within the rhelm of reality.
BTW, I just checked that a four-line family plan with unlimited high-speed data on TMo costs $180/month. Which carrier offers the same thing for $195/month? Verizon charges $260/month for four lines and 10 GB of shared data with no BYOD discount, Sprint charges $240/month for four lines and unlimited data, and AT&T charges $160/month for four lines with 10 GB of shared data (data overages apply). For four lines and 2.5 GB of high-speed data (unlimited throttled data) per line, TMo charges $140/month. These are not necessarily the same thing because the TMo and AT&T rates are BYOD no-contract plans, but that's how the market stacks up at the moment.