They made a huge mistake in thinking that players are more attached to leaders than to civilizations. In previous games, when we chose to play as France, it didn’t matter as much who was leading — what mattered was the feeling of actually playing as France.I disagree with that. Civ switching appears to be preventing a sizable portion of the potential playerbase from buying or playing Civ7. And even if any alternatives aren't universally appealing, you could hardly describe civ switching as appealing on the whole even if a minority likes it. In particular I can't see expansions turning out to be a good value proposition if Civ Switching remains... If they want long term value, selling DLC only usable for 1/3 of the game won't generate it at the price they're aiming for.
What’s even more difficult now is figuring out who my neighbors actually are, because at one moment it’s Rome, then suddenly it’s Spain, and the whole strange arrangement is being led by, say, Napoleon. I always get confused, thinking I’m playing against France because Napoleon is the leader, only to find out it’s Rome. Wait… now it’s Spain.