How so? Emacs has been extensible since it was written; vi wasn't until vim came around, and writing extensions in vimscript is pretty brutal compared to using

How so? Emacs has been extensible since it was written; vi wasn't until vim came around, and writing extensions in vimscript is pretty brutal compared to using elisp. Does vim have an equivalent to gnus, magit, eww, erc, emms, slack-mode, info &c.? Probably a few of those, but of the ones it has are they as mature?