Well you'll need to talk to your monopolistic carriers then. US mobile innovation is dead for the foreseeable future due to them, all new innovation is happening in China and other SE Asian markets.
You just need to be a good consumer and buy that iPhone that Verizon orders you to have with their blessing.
What you are describing is much more accurate of the US cell carriers before the iPhone. I remember paying $20/mo (to the carrier) for a terrible mail application on a feature phone. The iPhone's AT&T deal saved us from that situation.
What are some of the innovations you're referring to?
Huh? You think that the VoLTE requirement is something unique to the US? What new innovations are you referring to by the way?
Carriers in the US restricted the phones people used in the 00s and early 10s, back when there were short model whitelists, CDMA networks, and radios with only a few bands… but not so much today. Global market GSM phones activate pretty much on any US carrier just fine today.
2/3g deprecation and VoLTE is precisely because US carriers are pushing forward with new tech.