I have read a few articles about that. Jim Steel, a well respected strength coach, mentions squatting every day as well. he advocates setting a minimum weight of around 70% of your 1RM for a double and hitting it every single time you are in the gym while aiming higher a couple of days a week.
Other articles recommend going in double until you start grinding reps. Same goes for the bench. I'm training 4 days a week and may just hit squats every time whenever the power rack is free just to get the bar on my back.