Not yet, but there are ticket(s) for such bugs.
Yes. Forest trees are now in clusters based on the new unified noise function with a new growth ring around them, more bushes and added small tree/bush clusters. This technique will be done to other biomes. Wasteland ground is more natural, with new grass blocks mixed in and the old slope rule removed and different decorations.
I am referring to the 150 square tiles. It had empty tiles all around wilderness POIs, which is a waste of space.
That would need HDRP, which is not planned for 7dtd, but we are doing that for our next game using 7dtd engine, so it could be back ported some day, like years from now.
Tiles are a RWG data structure. They have nothing to do with actual in game terrain drawing from block values.