Comment by sodapopcan

I mean you learn things about the shell ans shell scripting in general which you do retain. Also shell config is one of those rare things that doesn't "inevitably break." The only stuff that breaks are related to program settings which omzsh isn't going to handle anyway. You end up learning a bit and have a much lighter config. Case-in-point, you had to spend some time combing through and learning all the aliases it defines you when you could maintain a small few that you actually want. Also, zsh has plugins natively.