The 8 is a ho-humm update, especially for those on a 6s and up.
Lack of any wow features, is also a major factor - wireless charging has been around for so long, there's a long established standard, so Apple isn't really blazing any trails with the 8 compared to other competitors.
They aren't blazing any trails with the X either. Name one thing that phone can do that say, a Note 8 cannot?