Connected Caves & Cave Biomes Improvement (Caves & Cliffs Update Idea)

I've been playing around the new caves and cliffs update and I noticed that a lot of the terrain generation regarding caves below 0 aren't that fun to explore since they where either very small gaps you had to dig through or amazing big caverns but with not much connection to other caves. Personally I'd like to see some more connection between all the cave's underground, like some big and extremely long and branching caverns that stretch for miles with a lot of underground seas, ravines leading to more big caverns and amazing sights where you can just take an elytra and just fly around down there and watch the beautiful scenery. Also I had this idea for the new Lush Caves biome where you could fill the big caverns with the biome instead of them being a chunk big part of a normal cave? I hope my ideas inspire mojang to create something fantastic with the upcoming update.