Why? I can definitely see Apple rolling this out to the Pro line first, then the regular iPhones, and then the SE. It could be like the home button, which disappeared on the X and then rolled through the 11s, and the SE will be the last to go.

The benefit will be better water/dust-proofing, and slightly more internal room for battery or whatever else. I have only just started charging wirelessly, but I find it works great for me. I know wired charging is faster, but only a handful of times a year do I care about that.