He likes to hit up on his 7 iron.
I tee it up every time I can legall do so. If I can see any of the tee standing behind the ball I tap it down. It is literally mm's from the surface of the tee box. I usually use a broken tee as well.
"I'm still surprised at the amount of people that use a tee for their higher lofted clubs when they rarely/if ever practice with these clubs with their ball teed up."
Then you must be surprised everytime you watch a tour event on TV because almost every tee shot is teed. Clearly best practice is to use a tee on the tee box. Granted you tee it down on short irons up through ?? iron. I think the point is that you use the tee to get a perfect lie, as opposed to something down in the grass.
"If you hit down enough on certain turf (ex. rye grass on clay based fairways - Northeast) you would understand why you might want the ball sitting down. "
I do, and no I don't understand. I think you obviously believe you are correct. You might just contemplate the possibility that you are wrong. You can achieve exactly the same result by teeing the ball down as Kevin has suggested.