The problem with OMF is that it is entirely based in an earlier work of mine Wahoo, which I put together over a weekend and while it improved over the very original oh-my-zsh clone, it was not very good.
See the merge commit here:
* https://github.com/oh-my-fish/oh-my-fish/commit/2693a2fd18bd...
And compare to Wahoo here:
* https://github.com/bucaran/wahoo
Fisherman is a project of a different caliber, forged over a longer period of time, truer to the UNIX philosophy in principle "everything is a stream", built for extensibility and to solve OMF slow shell start issue (that has been a problem ever since I joined the project almost 2 years ago) and of course, backward compatible with OMF/Wahoo plugin/theme ecosystem.