Drispstone caves and lush caves biomes spawn in small patches underground, making them ugly and hard to find. Most of the underground is no-biome, and this is okay, but only if when you find a biome is large enough to be appreciable. Here some screenshot. I take all screen of lush caves, because they are more easy to see, but same thing happens with dripstone caves.
So, what I suggest is to increase significantly the size of this biomes, making them much more appreciable. If needed, better increase de size and decrease the luckily of finding them.
Also, not all the underground is no biome/ small biomes, eventually you can find some bigger patch, but what I experienced is that they are really rare.
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Also, playing around in 21w40a, seems that lush and dripstone caves are limited in height in a gap of 10/30 blocks, so that in bigger caves the cealing is in glow berry and moss blocks but the floor is in stone/deeplate, and viceversa. That results in a really ugly biome placement, and snaturate the meaning of those biomes. Hope this is fixed before the 1.18 version drop.
Azalea trees also seems to appear close to each other in a spot more often compared to the experimental snapshots, so it might be the case.