I agree we need more foliage. Flora & fauna go together, and it is important to have foliage diversity to go with our growing animal diversity. It would seem to be a relatively easy solution to convert all the Planet Coaster flora to Planet Zoo. Looking through screenshots there are some great plants (esp. tropical) released with various Planet Coaster DLC packs that do not exist in Planet Zoo.
I really miss all the grasses and short ground cover plants from ZT2 - I feel like they've tried to replace them with the long grass terrain. The problem with that is many animals do not like a lot of long grass in their enclosures & it just doesn't have the same impact (especially when zoomed out). My savanna enclosures always feel especially barren as the only way we can really simulate long/dense grass is by sticking tonne of reeds through the floor.I would LOVE to have gotten more foliage in the DLC packs in the future. 3 trees is not much. Some scrub, small bushes, flowers ect would be appreciated. I feel like in general we don't have enough smaller foliage for some biomes.