Paste multiple lines in zsh they won’t be executed either (nor in modern bash if I’m not mistaken). I’m not sold by the rest; most of what I read is easily achieved with zsh (or even bash!).
While most of it is _possible_ with zsh and bash, actually achieving it all with either of those tends to require a ton of custom scripts, config, and plugins which then all need maintenance. As someone else in the comments here mentioned, all that extra config and customisation is technical debt. Fish gives you all of that for free and you never need to touch it. Outside of env vars and aliases, my entire config.fish is about 30 lines.
Until you have a default you don’t like and have to dig to find how to change it. Maybe fish’s defaults are saner than zsh’s (and even more than bash’s), but honestly I don’t think it changes much in the end.
