man-pages not installed by default

I installed tumbleweed a few days ago. Since then I've been using it, and I've
often used man and never hit a missing man page until now. I mean man pages for
stuff like rsync and ssh were present.

Then I wanted to looked up cp because I always forget for each command whether
the recursive option is -r or -R and to my surprise I got:

   $ man cp
   No manual entry for cp

Then I found out I just had to install the package man-pages. But it seems a
little ridiculous that it wasn't installed as part of the core system.

If that is a deliberate decision to save space... wait a moment, 6MB, no,
that's not a hypothesis worth considering. It must be an error in the packaging
of Tumbleweed.