Are Entertainment districts useful? Devoting an entire district to just 1-4 amenities seems quite wasteful. I assume they're only useful for planting on a useless tile to expand a late-game city.
Zoos and stadiums extend their effects to 6 tiles just like the industrial zone buildings, and the district itself adds +2 food to any internal trade route to that city. It's niche but it's not useless, especially if you're screwed on luxuries. I would like to see a buff to it though, I barely build it.