Because the more experienced people are able to spot major flaws in architecture or even business plans. In a culture of hush-hush of middle managers trying to cover up their mistakes from higher ups, or founders from investors, this is not welcome. They prefer blind unexperienced workers who will take things as gospel.
A lot of the business of middle managment is spin.
A legion of inexperience developers that you can shit on to work day and night can be spun into your managment being the saviour. A drama free experience contractor that does 9-5 and just delivers can't.
It goes all the way to the top though, because business is driven by those who can't really question or see through the bullshit.
Plus most of the experience guys will walk in the face of all the uselessness.
