When you know you have a job for the next n years at least, you also tend to put more effort into efficient processes. When you have to wonder every other month if you will still be there a lot will be just quick and dirty ad hoc solutions.

It is still not easy to find good people, but the truth is: HR are not the best people to decide who is. If you have good people already and they don't try to build an empire, they will select good people. The danger there is only that they will select people that are too much like themselves or they will select the worse candidate because they fear about their own standing etc.