I agree. The roof must be covered with Soul sand or else, it would look like any typical Nether Wastes. Soulsand Valley is perfect with its brownish palette.
I hope this is not an update to the Basalt Deltas. The biome with pure grayish palette is just perfect as it is.
I thought this multiplayer problem only happens to me, it's actually not fixed until today. It used to work connecting with friends without the need of internet. Please Mojang fix this, its been years. Some countries dont have that consistent connection to WiFi.