Every new Civ since 5 has been widely panned by players on launch, I wouldn't expect any different for this one. It's always because people are going from one game that has been polished and refined for years with lots of complex mechanics, usually added in expansions, to one that is simpler and with fewer features. It's the Civ cycle at this point.
From watching previews it seems Civ is taking quite a few cues from Humankind and Old World, so that's really exciting to see. I also don't ideologically oppose UI simplification in favor of controller support, but it's gotta be done well. Hope they can ultimately take this one beyond what 6 managed.