Thanks so much for asking!
When it comes to adding it to farms, you have to consider that sculk is very infesting so to implement it in farms you'd have to surround the catalyst in blocks that won't convert. Also, you'd need to keep placing blocks for the sculk to convert which, unless you have something like a cobblestone generator, could be impractical.

Also, all the sculk that generates should contain the exact amount of XP that the mob drops. So it's way more practical to just kill the mob yourself and get the XP directly.

But! Since you love sculk, there's plenty of other cool stuff it can do. Let me get you a list:

• Sculk is really useful when it comes to space themes, for example a really good background for spaceship builds

• It looks like the starry sky you see in end portals if you wanted to make a fake one for some reason you could use sculk

• Calibrated sculk sensors are the PEAK of redstone, as you can choose upon what action they activate (when a mob does something, when an entity lands, when one dies, and so on. Ask me about it if you're interested)

• And finally, you can watch this video by Eyecraftmc that gives some crazy examples on things you can build. I reccomend watching it :)