不敢想象 Vim 的默认配置没办法用 /etc/vimrc 来覆盖……
（啥啥啥我的确记得几年前还不是这个样子的呀？）

GitHub 上的一个评论：
……created a .vimrc just like the old days to override those particular annoyances, and whoops, suddenly ALL the defaults went away. Not syntax, no auto tab nothing. I have used vim for decades and I had to time going to figure out how to get those defaults back, and boy; it's pretty annoying to have to explicitly say yes I want the defaults in my .vimrc. Wouldn't it be more sensible to force a user to say explicitly NO I don't want the defaults. I don't want to start from scratch with vimrc, just tweak a few settings that aren't what I want?

Unix 系软件大多都是遵从着<默认配置> -> <系统级配置> -> <用户配置> 的逻辑的，后者可以覆盖前者。（虽然说是大多，但除了现在的 VIM 我是想不到一个反例就是了。）Vim 这种 <系统级配置> -> <默认配置> 异或 <用户配置> 的反人类设计我是的的确确无法理解。算了之后还是用 Emacs TRAMP 吧……