TBH I really liked getting NFP as timely DLCs.
That way we had time to digest them one at a time. However, as people have pointed out it's a QA disaster.
I played Civ VI this weekend on the train on my Switch and I forgot how slow it has become with NFP. That wasn't always the case. The base game that shipped on the Nintendo Switch SD card was surprisingly fast, even playing large maps.
Sounds like NFP style season pass is the future at Firaxis
My only problem with them and the schedule was that there were a couple of times, I knew a new civ and patch was coming out in like a week, so I didn't want to start a new game until I saw what was in the new pack. But yeah, the fact that it was on a schedule probably meant that you had less engagement on any pass item vs a normal expansion, but you basically had 6 chances to draw someone in.
So, for example, completely making up numbers, if you have a new expansion doubling the number of active users, and then falling off over time, if each NFP item only saw a 25% increase, because there were 6 of them, you basically have "150%" increase in active users now. Now, obviously, whether that engagement stays longer than a full expansion, who knows. But I could also see for a slightly more casual player, it's nicer to be able to have less features to learn and discover with each update. You don't have to learn a couple new major features and have 6 or 8 new civs sitting there to figure out, plus a bunch of rebalancing. You can focus on the 1 or 2 civs, and the 1 or 2 game modes or features.