I just tried the MSFS 2020 SU16 Beta to see if I could handle using the new ground textures. Sad to report that it’s a complete blurry mess (tested in South Australia). The terrain is now in even lower resolution quality than FSX or P3D. Something has been changed with the terrain LOD and the map tiling resolution. I believe it might have something to do with the sim no longer supporting 512x512 terrain texture tiles and is limited to 256x256.
Note to the developers: This issue has been brought over from 2024 to 2020 on SU16. I think it would be a huge mistake rolling it out in this state.