tiny, how does that not happen with any other type of rein attachment?
To a certain extent, it does. But the slobber straps, being wider, will put more feel on the round ring of the bit. They tend to kind of "rub"more on the metal; more surface area contacting it.
I really dislike the feel of reins that are attached to the rings of a snaffle with metal clips. I know they are convenient for trail riding because you can unsnap them if necessary for a variety of reasons. But, they offer no real smooth friction on the bit ring, so it's hard to give a very light and smooth transition of contact (from zero to more in very small, smooth increments). They tend to be either ON or OFF and they can also jangle around. If you can feel it even minutely in your hand, the horse can feel it ten times as much in his mouth.