Midbeads are used for alignment but like earlier post, correct position they look like a figure 8. If it doesn't, you need to adjust camber/cast of your stock or learn to put your head different (the most difficult of the 2). Once you get correct fit you seldom "see" (pay attention) to the midbead, always focus on your target. However, if a bad mount, even though you don't focus, you will notice the midbead out of place/alignment. Kinda hard to explain & I'm sure I'm butchering it bad.
I have NO idea why you would want to take one off. It would be like throwing your key fob (to your truck) away so you had to use your key only to unlock the door. You know you can grind the rib off the barrel to... If you learn a midbead it's like being naked without one, it's not necessary, just an additional check. But hey, if it works, use what works.
BTW, you don't aim a shotgun; you point it...