Each has to find what works best for themselves. I also prefer (read: I shoot better) straight-up. Yet I know of some who cant (no pun intended).
Remember, this isn't modern techno gagetry, and each of us is a little different. There is no "one size fits all" here. You have to find a mix if what works for you and what techniques are necessary to "correct" the issues with your comfortable form.
I too thought I had to cant the bow to keep an arrow from dropping off the shelf. After reading a segment in TBH by G. Fred, I realized it was my hand form imparting a torque on the string.
Shoot, shoot, shoot. If you are having problems that are constantly repeating, seek the correction for that aspect.
As far as "teaching aids", do what you see fit. Unless it is something dangerous (like bare shafting broadheads), nobody should tell you that you are wrong to try it. I also used things like a clicker and a thumb sling to gain a comfort and teach my brain. Your approach is correct, help get the basics engrained in, and then move on.
Good Luck!
BobW