I had the same gripe as the author. OhmyZSH seems too bloated for my needs. Added to that, the defaults adds (and oft unnecessary) emojis to prompts & outputs - something I don't find tasteful or appealing.
I stripped out most of the OhMyZsh functions (which is pretty modular given a shell package) and created a smaller, leaner package (leanZSH) having only the known stuff I may use. I have been using it without much complaints.
In a similar vein, there is slimzsh [1]. For me, it is a minimal config that enables everything that's useful, and only that. Quite a few others and I have been using this for more than a decade.
https://github.com/changs/slimzsh
I stripped out most of the OhMyZsh functions (which is pretty modular given a shell package) and created a smaller, leaner package (leanZSH) having only the known stuff I may use. I have been using it without much complaints.
https://github.com/gradientwolf/leanzsh