Bookstack's copy/paste is actually really slick and I appreciate it a ton.
I can highlight entire articles - images and links and all - and paste, and nearly all the formatting is preserved.
There's still a little bit of jank with images (both low res and high res versions get pasted??), but overall, I'm impressed with it.
A little social space created by a person with too much time on their hands, and some friends that wanted a little more control of their online presence.