it's pretty useful in early game TBH

It was in the earlier versions of the pack, but was removed to to either some conflicts or dupe bugs, I don't remember which.

I guess it was because of dupe. I was playing with a friend and suddently we got 3 /dank/nulls out of nothing. Since the devlopment of the modpack is active now, how about fixing the bugs and reimplementing it

As far as i know you can only dupe /dank/nulls that don't have an NBT tag. I think i can make a workaround if that's the only issue.

What's the benefit of having dank/null/ when there are storage drawers with void upgrade or trash bins?

The main mechanic players want from it, AFAIK, is being able to have a single-slot item that can store large amounts of several kinds of items (like a Forestry backpack), voiding overflow if needed (like a Void Satchel, for instance), as well as item storage blocks and a way to quickly dump the contents of the item into the blocks. So it's not just (and not primarily) a StorageDrawers knockoff.

I have heard that the Dank/Null is rather buggy, especially the station.

I think Forestry backpacks and a Void satchel could be a nice combination to replace /dan/null in most cases.