A good project manager is worth their weight in gold. Large scale projects are complex and have lots of moving parts. Someone who understands this and is good at keeping all the "parts" moving while heading off any potential issues is extremely valuable.
The problem is that often the people doing the hiring don't know what it takes to run a large project, much less what good project management looks like. They just hire some idiot with an agile certification whose only skill is moving items around a kanban board in a way that gives the illusion that progress is being made.