Honestly, it’s just another shell. Both Bash and ZSH happen to be mostly POSIX compliant, so stuff that works for Bash tends to work with ZSH too. For me it’s mostly just about the stuff I can add to it - I use the antidote plugin manager to get additional autocomplete, syntax highlighting, suggestions, async prompt updates, that kind of thing.
Didn’t the last Apple model with FW ship about that long ago? Last of their computers with said port I can think about is the 2012 Macbook.