I love that quote by Van Hargis. He said that often riders get frustrated and think their bit isn't working so they head out to their local feed shops and search through fifty different bits, ask for help from an associate (who doesn't know much and just recommends what the last guy said worked for him), and walk out with a "bigger" bit.
Then he asked us what we think is the proper tightness for a bit--one wrinkle, two? I think most people thought one wrinkle. He asked, Well, if it's already tight, where do they get their release? One lady raised her hand and said her horse always gets the bit under his tongue, so she was told to tighten it up. He answered that he would do the opposite, loosen it up.
His thinking is that the horse doesn't want the bit clanking around in its mouth, so it will pick it up and hold it, which is what he wants. And, if it's holding the bit, it can't get its tongue under it.
Also, only if the bit is somewhat loose can you give the horse its release.
His thinking about bits in general is that you don't need a bigger one if you follow the principles of "riding" your horse--actively moving in the saddle, and on the ground, always being in control of direction and momentum or lack thereof.
I wanted to ask him about bits and bitless--basically, if he thinks there is any need for a bit if you do the groundwork correctly and are riding your horse actively, but I got my hand up too late and it was over.