Will echo the "not needed" side. As others have mentioned, most people don't need it, LTE is plenty fast and widely available, wifi is everywhere so might not be much need for cellular data.
Re: power drain: not that I've heard/seen, but would not be surprised, and probably due to usage patterns and availability of cellular network.
When the iPhone 3G game out, plenty of people complaining about battery life, the network was slower than 2G. And probably true in that everyone was getting that iPhone and hammering away at ATT's under-built network. So, slow network, modem constantly banging away at the towers, using up power broadcasting. First iPhone with 4G followed a similar pattern along with the "modem sucks" comments. As the networks built out and the modems got better, everyone saw improvements all around.
Add in dead zones and weak signals causing modem hopping between different network types, can see drain as the modem keeps pinging. Heck, see that with my SE2 as I live in a cellular dead zone and "Cellular Network" can pop-up fairly high in the battery usage report even though I'm on wifi and not really using the phone (just playing podcasts).