Single Biome ocean worlds don't have a lot of ocean

When selecting the biome in Single Biome world gen, one would expect to see that biomes which are ocean generate as an ocean with nearly the entire surface below y 63. However, the ocean biomes generate much the same as any other biomes, leading to large amounts of hills and sometimes mountains and very small oceans.

I know exactly why this is happening, but since very few people ever think about the other world options this seems to have been ignored. I would suggest that Single Biome generation (as well as Island and Cave generation when they are reimplemented) be reverted to pre-1.18 terrain noise so people can play in ocean-only worlds and have an actual challenge finding resources instead of just spawning on a hill and finding everything easily.