I think there is also a different thing going on. Most companies expect their hires to already have significant experience, but little are ready to train new hires to match (future) needs. It's understandable where it comes from: employees are not that loyal anymore, so any training would be an investment that returns to somebody else.

On the other hand, times when companies were loyal to their employees are long gone, and this is pretty much why employees switch jobs so often nowadays.