If you carry appendix now on a regular or daily basis, I seriously doubt its a fashion that will pass. You know its advantages, and arent likely going to go back to what you were doing previously. I know Im not. And why would you?
Its those who dont have any real experience with it to be comfortable with it, that dont understand its advantages and usefulness.
As 21H40 pointed out, its much quicker and easier to get the gun out and going, its much easier to protect the gun when in tight, crowded places, or should you get into a struggle, and concealing "full sized" handguns is very easy, even in just an untucked tee shirt of normal size.
You actually almost have to work at getting the gun to print, and unlike most of the other methods of belt carry, bending over at the waist actually aids in hiding the gun. It basically eliminates the "bump frisk" as well.
You have easy access to the gun while seated and telegraphing the draw, from all positions, is pretty much all but eliminated.
I suppose comfort could be directly related to your body shape and weight, but Ive carried this way within a 25# weight range, and never had a problem doing so, and have always found it comfortable, after a brief learning curve in getting used to it in the beginning. As with any of the other ways of carry, being in decent shape is always a plus, and that goes for everything about carrying and using the gun too. If how you carry makes you more conscious and aware of that, and helps you to maintain a good weight, how is that a bad thing
Reholstering AIWB, at least in my mind, is safer than most all the other ways most carry, as you can easily watch what you are doing while you do so. You can actually see if there may be something in the way that could be a problem, and watch the gun go into the holster. Youre also more clearly seeing the gun as you do, and can see that maybe you didnt decock or resafe the gun, so its just another safety check in the process.
Ive carried handguns on a daily basis my whole life and used pretty much any method of carry and holster you can think of, looking for "the one", and AIWB is as close as I think you can get to that level of perfection. Glock or not.