LTE in my view is quite comparable to fixed line broadband in most internet applications, clearly good enough for VOIP given voLTE technology, might be not good enough for twitch shooters yet tho, but I think for most other types of usage its good enough. It is also reliable, note when I had my cabinet issues I was running 24/7 with my phone connected to my pfsense unit as the internet provider.
3G always felt like a heavily interleaved line where there lag for websites to start loading and SSH was pretty laggy to use, but with LTE both those issues are vastly improved.
The 2 showstoppers for LTE is coverage in villages (which I agree is a joke but easily solved by a USO if gov has the balls to introduce it) and the usage limitations which is solved by investment from the providers (extra masts and backhauls to those masts). BT may have decided its cheaper to mass deploy LTE than to rollout extra fibre in the local loop.