There are groups of individuals who just require output from Windchill and don't put anything back in, or what they do put back in is in the form of change objects or documentation.
Currently much of the new License profiles do not support creating new workspaces or using workspaces.
You are required to have a heavy or PTC Mechanical Design I License to create a workspace and use Creo.
I know they can use Creo View, but sometimes that's not enough. Especially if something doesn't publish, then it can't be worked without upgrading a license or getting someone else to do it. I'm sure PTC wants you to have the full up license just to open Creo models, but to me it just doesn't always make sense from a business case.
Creo view also has issues. The integration with Acrobat can be unstable, and it puts a dependency on the publishers working 100% of the time.