For me, I really want to get into niri, but the lack of XWayland support scares me (I know there’s solutions, but I don’t understand them yet).
Also, I stopped using Emacs (even though I love its design and philosophy with my whole heart) because it’s very slow, even as a daemon.
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Not OP , but regarding zsh, it has much better auto completion, and suggestion support. Additionally you can theme your prompt much more, see for example powerlevel10k
zsh has vi mode
Honestly, the only btrfs feature that interests me is the snapshotting, as the current state of my backups is rather sub-par. There’s just a lot of inertia involved in adopting it when ext4 Just Works™. Maybe next time I install a new system I’ll give it a shot.
As for zsh, I rather like the general “intelligence” I see on others’ machines: the way it autocorrects typos, draws a navigable menu for tab completions complete with colour highlighting… it looks lovely. I’ve been a Bash user for 25 years though, and muscle memory like smashing the tab key to get what I want is a hard habit to break.