It's amazing what Tectonic does, but in my opinion, caves destroy the landscape sometimes...

My suggestion is to reduce the amount of caves generated on the surface. I've seen another terrain generation mod do this so it's probably possible.

Might be a bit difficult on the code side to do this but I'll look into it.

If possible, could this be made into a configuration option? I do like some of the noise caves on the surface in Vanilla, but having the ability to only close off a variable density of noise caves (and possibly non-noise ones as well) would be very useful, as Vanilla has far too many caves.

As for disabling non-noise cave entrances, I disable them in Natural Philosophy by overwriting the cave JSONs to give caves a zero probability, eliminating them. This was done to reduce not only the amount of surface caves - to have a less-broken surface - but to make noise caves more dominant for world generation at the "surface" level. I think most of the datapacks which do reduce caves do something similar, as I took inspiration for that solution from another datapack.

I would also like to ask the developer Teсtonic to add a setting to the .json configurator to exclude caves.
Because I want to use your mod with an RTS mod. And the problem with the standard generator is that there is too unstable a landscape and a lot of mountains. Which is very difficult to combine with the RTS mod.
And the testonis mod did everything perfectly and removed the mountains and levelled the ground, leaving a flat geometry of the landscape. But today I noticed that my TPS was 11-15 with 4 players on the server. And I did level tests and found out that the caves were putting a lot of load on the server. And with the RTS mod, I can't use them. Therefore, I want to ask the developer to add the ability to completely exclude underground tunnels.
I was using 1.19.2 forge. Because the RTS mod is only available on this version.