The point is not having to reach inside at all. Heck, most times I don’t even have to try too hard to aim. The side of my thumbs (which are being used to hold down the elastic anyway) keep things from going too far right or left. No other place to go but straight down.
I end up washing my hands anyway...but most of the time, I can do the whole process with zero grabbing or hand holding at all. I can’t imagine having to unzip, reach in, reach through, grab, fish it out, hold it, then try to stuff everything back in when I’m done. It sounds like trying to put Pillsbury biscuits back in the cardboard roll.