I think it really depends on the industry. If you're in a tech company with lots of experienced software people in charge then it's different. But the majority

I think it really depends on the industry. If you're in a tech company with lots of experienced software people in charge then it's different. But the majority of projects I've worked on (and, I'd argue, the majority of projects) are about getting software into non-software businesses. In that case, the problem is you need PMs who are well versed in the domain, software, AND project management. But typically, you get people who have done a PMI or Some Agile Framework™ course and think they know how to do it.