Earlier quoted context omitted.
Let's discuss text editors. Anyone?
lol @ Vim users that have to write configuration files, memorize complicated keyboard shortcuts, and install 20 plugins just to be able to copy and paste text between files. It's 2016, try using a real editor like Atom. (Am I doing it right?)
I frequently have two files open side-by-side.
If I want to copy the current line in the left file to the right file, the keystrokes are:
yylp
It's really not that hard to copy between files in Vim. :P