Why is the video property bound to creative work?

When working on markup for a MedicalProcedure I ran into the issue of not
having the 'video' property available to link an embedded video, explaining
the MedicalProcedure, to the entity.

But while looking for a solution in the full list of types at schema.org I
started to wonder, wouldn't the 'video' property be usefull on plenty of
more types than just CreativeWork. For example a 'video' about a person,
organization, product, service or MedicalProcedure is quite common, yet
there's no way to link a video to any of those types.

Of course the workaround for this would be an multi-type entity as in
"Product CreativeWork" but somehow that just feels wrong. Looking at how
much embedded video is used, wouldn't it be better if the 'video' property
moved up the chain and became part of 'Thing'?