Tabs - That's the way god intended it. Stop trying to force your indentation width on me.
Stable working directory - This is how every text editor I'm aware of works. I can see use cases where you might want to change it manually or automatically, but I don't want to have to guess which directory I'm in every time I open a file.
Even some seeming no brainers like turning syntax highlighting on can be terrible because it doesn't work well with dark backgrounds or other random colour schemes.
vim module/code.cpp
:make
Not use the build system on the top level...Especially since I have my vim configuration and other dotfiles in Git. Just git clone and I am done.
Off course that is too much when I am only using a machine temporarily (like servers over ssh), but I can be productive with the default as well. It is just that with my configured vim I am more productive.
:help netrw