Thanks for your reply.

Vietnam might very well be fun to play, but my take on it is that this civ is a bit all over the place to be dominant for any type of victory. So it will be mediocre at all of them. In general not being able to place a district because of a rainforest tile quite frankly happens in your capital and maybe in your second city for at most one district (you won't have the population for more), but it's situational. And even if it does happen, you can mitigate it by turn 30ish (you're not gonna wait until turn 30 to unlock mining if you're looking to make use of unique crossbowmen!). On the other hand, Vietnam needs woods and forests to place districts, so building high adjacency districts will be a real challenge for 100 turns until it gets to Medieval Faeries. And even with medieval faeries, you need to waste a builder charge just to place a district down. You'll probably reroll until you get a good start with lots of woods, but can you do it reliably for 12-16 cities? I don't think so. If I need a builder to plant woods just to place a district, this means I waste one out of three builder charges. That's an indirect builder penalty because I need more builders than other civs. Furthermore, imagine how difficult it would be for Vietnam to get wonders on deity in the first 100 turns. How many forest tiles it needs for one wonder and 3 specialty districts??? 7-9 wooded tiles? That's asking for a lot of forests! And if you do have that many forested tiles, where is your production early on since you cannot improve forests until lumber mills? If you're not chopping you're missing out on population, meaning you're working fewer tiles and you're having fewer districts, etc. For all its bonuses, my guess is this civ will have a rather slow start. Yes, it's fun to imagine rushing your neighbor with your UU, but can you do it quickly enough though? I have a hard time believing Vietnam will have the production, the science, the culture and the gold to get in position before turn 100.