What are the barriers to developing a UX culture? [closed]

In a recent question about measuring the embeddedness of UX practices in a company, I suggested the Feijo Maturity Model. How to assess how embedded UX is in an organization or team?

If we assume that this model makes sense, what are some real-world obstacles to moving up the scale?

If you consider this question in the context of your company, or your clients’ companies, what are some obvious (or not so obvious) reasons they don’t score any better than they do? What's holding them back?

The example that seems most obvious to me is the existence of firm boundaries between departments – working in silos – and the resulting inability (or reluctance) of contributors to be part of the truly collaborative solutions.

I think answers to this might provide a useful starting point in defining strategies to build UX culture in an organization or team.