> You can explore the doc for each layer by "SPC f e h". You can even jump to source from there.

But does it offer an access to the main docs? When I type "spacemacs" in there I get an empty README.md.

> Everything that works in stock Emacs should work in Spacemacs. Stock Emacs key bindings are always there

Yep, but I'm not an Emacs user so I do not know them!

> I think it should exist.

Well, you can try :h for yourself...

> However, even NeoVim wants to remove it: https://github.com/neovim/neovim/issues/1089

They are talking about removing Ex mode, not ex commands!

> I believe in Vim I can create empty buffers.

I don't believe in Vim you get an easy way to create a buffer that has a name that is not a filename...