Oh-my-zsh has a lot of cool and handy features, but it is a huge and complex beast. Personally, I only cared about 3–4 features, so I simply removed it and sought out how to enable those features alone. Additionally, a lot of functionality which I wanted wasn’t there in OMZ, so my setup had a lot of custom bits anyway. My zshrc, for reference: https://git.sr.ht/~whynothugo/dotfiles/tree/269248912920d25e...
export LESS='-RX --quit-if-one-screen'