I'd recommend giving it another go and digging into the documentation. They've made the UX much less clunky and support panes now as well as tabs, proper copy/paste etc. My only wish is modal keybindings but if I cared enough I'd send a PR for them.

It was extremely barebones six months ago but it's come a long way, and faster than anything else I've tried.

I'd see that video more as a "where we want to head this tool in the future" rather than an actual showcase of its current state to be honest