Magit is not an "application based on Emacs", it's an extremely powerful git plugin for someone who is already using Emacs. If you're not using Emacs, it would be crazy to fire up Magit just to do a git commit or rebase. Even the fact that you'd have to learn Emacs' extremely idiosyncratic keyboard shortcuts, and even keyboard shortcut help (what do you mean "save is C-x C-s?" what does that even mean?) is a huge problem not worth the effort.

And I'm saying this as someone who has exclusively programmed in Emacs with Magit for the last 5 years in my job.