Oh My Zsh is still getting recommended a lot. The main problem with Oh My Zsh is that it adds a lot of unnecessary bloat that affects shell startup time.
Since OMZ is written in shell scripts, every time you open a new terminal tab, it has to interpret all those scripts. Most likely, you don't need OMZ at all.
Here are the timings from the default setup with a few plugins (git, zsh-autosuggestions, zsh-autocomplete) that are usually recommended:
➜ ~ /usr/bin/time -f "%e seconds" zsh -i -c exit 0 .38 seconds
And that's only for prompt and a new shell instance, without actually measuring the git plugin and virtual env plugins (which are often used for Python). Creating a new tab takes some time for your terminal, too. It feels like a whole second to me when opening a new tab in a folder with a git repository.
My workflows involve opening and closing up to hundreds of terminal or tmux tabs a day. I do everything from the terminal. Just imagine that opening a new tab in a text editor would take half a second every time.
Once in a while, it also checks for updates, which can take up to a few seconds when you open a new tab.
I see no reason in frequent updates for my shell configuration. Especially, when a lot of third-party plugins are getting updates too. Why would you want you shell to fetch updates?
My advice is to start simple and only add what you really need.
Minimal Zsh configuration
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