4G is very hit or miss geographically, and "unlimited" data plans tend to throttle you at usage as low as 2GB/mo, and will refuse to renew your contact if you use too much too regularly (now that contacts are rare, that often means justa few consecutive months over an unwritten amount will get you terminated.

doesn't matter if there's no LTE (or even 4G) out there.

I can't speak for the rest of the nation, but a couple years ago the big ISPs in the midwest started phasing in 1tb data caps.