Your management probably doesn't want to hear any of your advice. You're welcome to tell them whatever you want, but be cognizant that it'll be about as effective as going to a confessional, or complaining to your bartender.
You're about to quit. Why are you taking on the task of improving the company hiring process? Are you out of personal projects to work on? These people are busy digging their own grave, don't knock the shovels out of their hands, they'll just hit you with them.