Role Playing: While I personally try to work my way through all the leaders, as a gameplay goal, I've seen other posts from people here to have a favorite leader and consistently play them. Anton values the players who are still role playing with only 100 hours in the game, as well as players who have thoroughly engaged with 2000 hours in the game.
Ice Cream Toppings: That metaphor works for me. Could mix and match, but were designed *on purpose* to be independent. He said that he believed the underlying systems in Civ VI were well tested and stable, so that the ice cream toppings would affect only a certain portion of the game. Given the schedule (see below), testing for each mode would have to be limited.
Rolling Development Schedule: I heard Anton talk about some struggles and challenges with that model, the difference between Firaxis's past practices of big, complex expansion packs and the episodes of the NFP. He didn't give a full endorsement of NFP releases and he stopped short of saying, "that approach was really painful, I would not do that again." It would be interesting to learn the opinion of people on the current Civ VII team, who lived through both an expansion pack (GS) and NFP; as Anton noted, he has taken a position with a new company.
Valuing Other Points of View: I'm also a cis-gendered white male. As I talk to more and more people who are not, as I learn more stories from people who have other backgrounds, I realize how much it matters to them to see and hear their stories told. Those values appeal to me as human values; I'm glad that those values are also shared by game designers.