The Meaning of Life, the Universe, and Everything.
Dripstone is only useful as a decorative block, and not a very attractive one at that.
So, this makes dripstone caves just an annoyance. Please add things to it that make them more interesting. I recommend adding more of most kinds of (altitude-appropriate) resources to these caves, in the walls, floors, and ceilings.
Yes dripstone can be used in lava farms, mostly. Also stalagmites are viable as a killing way for mob farms where you don't have enough height left to do a full lethal fall damage, as they quite double the fall damage.