LOL what the hell is Microsoft doing this go around?
Offering a lower cost unit for people who don't need 4K. It's like offering a Mustang with a Ecoboost 4 and a v8. People want to be able to play the new games (next gen) that are not available on the older platform and may not want to spend $499 to do it? It's a lower cost alternative. Some people have no need for 4k because they are perfectly fine with 1080p and do not have any intent to upgrade their other hardware.
The naming convention is stupid and confusing to a lot of people.