Thanks for the explanation. I now understand that you can not write everything into a license.
Still, distinguishing between "contract including a license" and "license is contract" seem to be legal nitpicking for me - esp. if the "contract" part only is about "use the software and follow the terms of the license", not even including payments.
Anyway - I assume this difference has no actual effect on the base topic of this discussion. Or has it? (Otherwise we could stop here.)
@lxo