I know it's still in development, but they look a little blocky as they are right now.

I tried building some myself to see if I could improve them. Made them a bit fluffier. The two on the left are mine.

I made some that work with decayable leaves. Here's the world save with them so you can check them out yourself. It's currently frozen so that no leaves will decay and no hangers will grow.

That won't work, leaves need to be adjacent a log or to leaves connected to a log within 5 blocks

Most of them are next to or close to logs. I'll try making one and then replacing the leaves with decayable ones.

Diagonals don't count. I mean the idea is nice, but then we'd need to reimplement the decay logic for just this tree, and generating it like that also isn't an easy task

Tweaked it, then replaced all leaves with decayable ones with a fill command. Sped up randomTickSpeed for a bit and the leaves seemed to stay. It's possible without diagonals.

Not atm - we are happy with them as they are and will not spend time on them.