1) If you look on Youtube there is a video showing how to set an iphone to auto connect and disconnect from tethering.
2) If I let every provider that wanted $10 a month have it I'd have another house payment. They've all reached for the recurring payment money grab.
3) AT&T network: It's poor around here. I worked for AT&T (phone company, not cell) for 6 years. We were required to use AT&T wireless. But exception swere endless because coverage was so bad. Good I know in metro area's, not so good in rural. Yes, I know some will feel it's great. Cool, happy for you.
Net: It's not too important to me either way. It's my wife's and she's going to take a while, if ever, to use the tech well. I'm likely to stream from an attached USB anyway, and/or BT into my phone for Sirius, so it's not much of a loss. I can say it it's an issue that affects her I'll insta write the check.
Now if nav handled alternate routes, traffic jam re-routing, intermediate waypoints, multi-points w/best case routing, etc that would be different.