One possibility is that at least some of the things that have been highlighted were highlighted because that mechanic is going to receive a significant overhaul in Civ 7; i.e. they're reviewing not just the history and evolution of the series, generally, but also setting up some topics that will be part of the marketing pitch for Civ 7. For example, the high council revolutionizing diplomacy in Civ 2 was an odd choice unless the council and/or diplomacy are going to feature prominently in "what's new for Civ 7".
Another possibility is that the mechanics that are mentioned will appear in Civ 7, either in a similar form as in Civ 6 or slightly modified, and that it's the things that weren't mentioned that may be the subject of the most significant changes. For example, happiness / amenities were never mentioned, possibly because something new is coming to replace them.
A third possibility is that the series is simply to remind the buying public of Civ's long history and drum up interest in Civ 7, and that the specific mechanics mentioned were chosen randomly or at least without any consideration of what's new in Civ 7.
Mostly it's just fun to look back at past games in the series, review what was new and revolutionary about them, and then compare that to what got highlighted in the series. The more recent offerings more-or-less align to what I suspect most people would have picked, but some of the earlier game retrospectives had some headscratchers.
Yeah, it seems fair to assume that the pieces highlighted are either not returning in VII, are core items returning to VII, or will be changed in some way for VII. I think there's a strong chance that one of those 3 will be correct for each of the features listed.
That was my take on that when the discussion came about. Having separate abilities is good, but having abilities that take 5 minutes to parse and describe just needlessly complicates things. Like Workshop of the World literally is 6 different bonuses applied together. I bet even the best civ players will tend to forget one of those bonuses even if you just finished a game as England.If I remember correctly, he was talking about stuff like England's Workshop of the World ability from Gathering Storm. There was way too much text with way too much going on. You can still have separate leader and civ abilities while still keeping them simple. I think the leader/civ ability split is probably going to stick around because it gives them a lot of flexibility and feel like multiple leaders per civ was actually popular, but that's just a guess on my part.