Emacs, as has been said time and again, is not a text editor. It is, if anything, a development shell. It contains a text editing program (the default program), and that program does not manage child processes or SSH or Git.
You could also take the stance that Emacs _is_ a program that "does one thing well:" develop programs. That's the actual task of importance. Text editing is a secondary, ancillary task that owes its importance entirely to the archaic practice of representing complex interrelationships between data and operations on those data as a static linear stream of ASCII-encoded bytes.
Unfortunately, almost all programming languages are like this (hence, "languages"), but if you ever use Emacs to edit Lisp, you'll find that it's far less like text editing than it is like directly manipulating the abstract structure of the program. It does a reasonable job trying to replicate this experience in other languages, but when you have utterly inane constructions like seventeen-precedence-level infix notation, there's only so much you can do.
