I gave this practice a try, and it made a really big change in the way I play (at least for now)
I did this drill with every throw being a backhand. I have been playing for about 3 or 4 years, but only seriously in the summers usually. I'm comfortable reaching 300 foot stuff, and get really excited when I throw anything further than 340 or 350 on flat ground.
Anyway, I've always sort of avoided uncomfortable throws in my game by simply making up a more comfortable way to throw it. If there was ever a way to make a tomahawk, sidearm, or roller replace a shot with an uncomfortable amount of hyzer/anhyzer, then I would take it. But this drill forced me to get comfortable with them without the risk of an embarrassing scorecard

That said, as I was doing this it was largely trial and error to figure out how much hyzer I needed to make an understable driver still fade, a putter go straight for 250 feet, etc. It had always been just guesswork for the past few years, but this drill allowed me to make sort of a system for it.
The system is this, and feel free to evaluate it for better or for worse. On every throw, the basic mechanics of the shot is the same. The only thing that I change is which part of my body I throw the disc from. To be specific, I have nose, shoulder, chest, bottom of the ribs, belly button, belt, belt with disc pointed to the ground, and belt with disc pointed to the feet. So with this system, if a disc went right when I wanted it to go straight, I just moved it down another notch in the system.
So for me, this drill really built confidence for me because I am no longer throwing shots by feel, but I am just duplicating a shot that I already know works. Teebird needs to go right? Just throw it from the ribs. No more guesswork involved in my rounds, it's just a simple plug and chug formula.
I think this has also helped my form because my throw is simpler now because I simply line up the disc at the correct position BEFORE the throw, so it takes a lot of thought out of the process for me and allows me to just focus in a good clean throw without worrying about where it goes.
The only thing that worries me is if this system is going to mess up my throwing mechanics in the long run. Any comments?