Cheers for the video that was cool to watch. 
I was, as a PC gamer, looking at that prototype and thinking, damn, I would have loved to have got my hands on that. It certainly didn’t look overly complex when compared to other PC games of the genre, on first impression I’d say it was around the mark of Silent Storm, and there’s games in other genres that take that complexity and square it; Panza General, Temple of Elemental Evil, Football Manager. I don’t think that the guys playing those games would have been looking at that early Xcom prototype and thinking that it was too complex.
I think the pertinent question is at what stage of development did they have a target audience of console gamers? Just the fact that a game is going to be played on a controller vs mouse and keyboard means that it’s going to be dumbed down to accommodate, but the whole concept of what is ‘fun’ in a game also changes when you move platform.
I think we’ve had this to an extent with PP TBH, the game feels like it is in a lot of ways being developed with consoles in mind. The movement system, the aiming system (pretty much built for a controller), the reduced number of solider stats, and the addition of perks instead, even the UI.