Perhaps you are a more discerning filesystem user than I am, but I don't think I've actually noticed any difference on btrfs except that I can use snapshots and deduplication.
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
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.
Actually, tutorials like that are a big reason that I don't want to switch. The first steps are things like:
Install these fonts that only work in a GUI environment
Install these programs straight from GitHub without your package manager
...and all I hear is: "this stuff isn't ready yet" and "I'm going to be staring at Unicode glyphs the next time I have to tinker outside of my GUI".
If I can't easily and securely install a shell on every environment I use as I don't want to be constantly context switching, then I'm going to have to stick to Bash.
...and all I hear is: "this stuff isn't ready yet" and "I'm going to be starring at Unicode glyphs the next time I have to tinker outside of my GUI".
This really isn't a zsh problem, but a "people putting too much stuff in a 'getting started' config".
I used zsh for 15 years before looking at any plug-in manager, you can get a lot of the good stuff like the completion by just going through the first-run wizard included in zsh. A lot of stuff is included directly with zsh, including various prompt themes (which is what that tutorial wants extra fonts for, because they use a fancy prompt with custom glyphs; I don't think any of the built-in ones need that)
Things like fuzzy history search with fzf is usually included with fzf's distro package and the additional zsh-completions package for less used or newer commands is also packaged by most distros. In my experience, a lot of the other plugins are stuff that could be a standalone script instead of a plug-in anyway.