Thankfully not all of us need nationwide coverage everyday.
Don't know about you, but when I travel my phone seems to just work; I guess I don't give it too much thought though? If I do find myself in the bowels of a huge building or 3 levels down an underground parking space and I lose signal for 5 minutes of my life I just shake it off for what it is. I'm saving my company $12k each month by using T-Mobile over the competition and don't bat an eye over it.
I consider HoFo subscribers more astute and aware of mobile technology and carrier coverage. If T-Mobile is that terrible in the areas they live or work they won't use it. Neither would I.
It's my opinion that coverage shouldn't be described in absolute terms nationwide and for many people T-Mobile works just fine. Not sure why that concept is so hard for you to understand or if you are using the lounge to troll your anti- T-Mobile agenda?