As the "stadium" thread is mostly about "real" stadia and improvements, additions and inaccuracies etc, I think it might be an idea to have a spin off one for the generics.
So I'll start by suggesting what type of generic stadia we're "missing" in FIFA16 and what I'd like to see in FIFA17.
1: A 20000-30000 "British" style stadium with a curved roof line (I'm thinking about Macron Stadium, and the John Smiths Stadium, but also this is a popular shape for "new" stadia all around the world. Sanderson Park is simply too big.
2: Gold Lake Stadium from the World Cup game. Perfect for MLS and A-League sides (architecturally)
3: Bring back "Estadio Chamartin" that was used when they didn't have rights for Bernabeau. There are many latin clubs that would suit this stadium (it was about the same tier layout as Bernabeu, but without a roof) Would also like to see a "Barcelona" version of this now as well.
4: A generic stadium based on the Emirates, again this style would be excellent as a lot of new stadia share this general look (Jose Alvalade, Estadio La Luz etc)
5: Customisation of the generic stadiums. Give us the option to choose elements like the crowd fencing, or the catch netting behind the goals. Could the "automatic" customisation (where the club's badge appears on the pitch and stands, be extended to seat and hoarding colour too? (To be fair, this looks like it might have happened)