A potential cause of this is a lack of training capacity on the hiring side of the table.
If your company has strong training and mentoring capabilities, then it’s more important to hire candidates who display integrity and willingness to learn than it is to hire for existing skillset.
This capability is rooted the organization’s structure and strategy, and relies on having great employees already.
As Kim Goodwin points out in her 2016 Interaction Design Education Summit keynote, a large proportion of the people practicing in our field are badly trained.
I agree with this analysis, and in my opinion, this is what drives the vicious cycle of insufficient growth and insufficient skill development that plagues UX as a field. People who don’t know, can’t teach.