bck-i was always a bit obtuse to me and I honestly never grokked it until I had Atuin wired into my workflow (hard) and ran into bck-i instead when SSH'd.
Anytime a peer views my screenshare, they ask "what's the funny thing that makes you so fast". I then proceed to share, first and foremost, Atuin.
Thanks Atuin team! Would love to contribute someday with more time.