I grew tired of tinkering with it and I didn't see many upsides compared to using standard and de-facto standard Unix utilities.
So what now, ed(1)?
I found with time that many Unix utilities are very painful and unintuitive to use regularly. The Unix command line is a hell that Emacs can't save you from entirely, but it has many features that can lessen the pain like Dired, Info, rgrep, vc/magit, eshell and so on. In any case, I just don't see a reason to want to abandon all of Emacs, since it's still the finest editor you can have on any system.