What were the "lot of elements" in the screenshot? Ignoring shell stuff, is it the bar at the bottom? Is it the "[0]" and the "0:bash*"? The "Macbook-pro" might seem familiar to someone familiar to the shell, who is used to seeing it in the prompt of an uncustomized shell. The date and time likewise seem obvious what they mean. Am I missing anything?
I think the keybindings being non-mnemonic there's only so much you can do about. Vim's hjkl were mnemonic on the VT-100 terminal, but keybindings outlast mortal hardware. So the ability to rebind is in some ways the best you can get IMO.
Zooming out, the best power UI I've been able to come up with is a combination of a Wordstar-like always-on menu showing common keybindings, and a command palette. Here are a couple of UIs I've made, I'm curious what you think of them:
https://merveilles.town/@akkartik/108766067153506592
https://github.com/akkartik/mu/blob/main/html/20210624-shell...