> regarding layouts/panes: the panes you configure in the layouts are still resizable a runtime. It just saves you the initial setup.
I might use a "save current layout as a template" command, I guess. But I don't think I'd ever bother to learn the custom configuration format for building these myself. If you already have such a command, I'd suggest highlighting that on the site instead of a screenshot of YAML.
> imagine custom expandable folds depending on content, notifications depending on content
OK, this seems like it might be interesting to play with. Is there any "killer plugin" for it yet?
FWIW, this is available in tmux as a plugin. Very convenient and highly recommended.
https://github.com/tmux-plugins/tmux-resurrect
I haven't tried Zellij, but it looks interesting. This is a great feature, and I think incorporating it into the base software reflects good UX priorities.