Ok only the third video, great removed features not under copyright:
- Isometric Screenshots
World Settings
World Type
- Island
- Floating
- Flat
- Inland
World Shape And Size
- Square
- Long
- Deep
World Themes
- Normal
- Hell
- Paradise
- Woods
Further reading:
https://minecraft.fandom.com/wiki/Java_Edition_Indev
https://minecraft.fandom.com/wiki/Indev_map_settings
Also I am sorry that I compared Cosmic Reach that much to Minecraft. I know it must get tiring to see that many comments messing that up.