Pure zsh is alright, it's pretty much just bash with fantastic autocomplete that usually provides short form documentation right there along with the options. So no need to remember (or look up) what -X -d -f stands for. Get rid of oh-my-zsh and give the proper shell another chance.
If you've only compared against zsh's out-of-the-box completion then you're comparing against the fully backward compatible with how things were in 1993 state. Turn on compinit, and a half-dozen styles to enable descriptions at the very least. The content of `StartupFiles/zshrc` from zsh sources is more than enough, no need for a bloated framework like oh-my-zsh.
I'm being downvoted because I equated zsh with oh-my-zsh (or actually, maybe because I hate MacOS?), but if you look through the rest of the comments you'll notice that most people are asking for a lighter weight omz or wishing that some omz alternative hasn't been discontinued.
But think about trying to onboard with a shell. Imagine the type of help you'll get online, and where that inevitably pushes you. Consider these two things:
1. The number of people using pure zsh config Vs plugin systems like OMZ.
2. The number of people using pure bash config Vs some plugin system (can't even name one)....
With bash, when you try to figure out how to do something, the internet will usually spit out a snippet of pure bash. The same search on zsh will generally tell you which plugin you need to add to OMZ.
Zsh would likely be easier to adopt, and overall better off, if it didn't have an extremely bloated plugin system almost synonymous with it. I'm sure if I started from scratch with zsh years ago I'd have a great zshrc. Or if I had the time and energy to devote to getting zsh working to my taste without plugins, I'd do that. But vanilla zsh wasn't to my liking and I took, what seemed like, the path of least resistance. For a short while it I stuck it out, trying to gradually tweak it into shape. But I couldn't figure out how to correct some "fucking weird" behaviour, and digging into a bunch of insanely complex plugins was just way harder that looking at a zshrc. I eventually dumped the whole lot for bash and never looked back.
Could I have dumped OMZ and started clean? Yep. But I was tired, and bash works.
