What if I own a company and don't want my employees to have a voice in how things are done? Why shouldn't that be allowed?

And what if I hire workers to build me a house - should they be entitled to parts of the house after they build it? Or what if they absolute want to put marble into the bathroom, but I don't? Should they be entitled to put marble, because after all they are doing the work?

Meaning what is wrong with making a contract and fulfilling it? You do work x for me, I give you money y in return? Why make things more complicated?