Just to present the other side of the arguement I have a tang sight on all my cowboy rifles, main match and long range guns. My eyes will not focus on rear buckhorn, front sight and target so I use a tang sight with the peep disc removed, basically becomes a ghost ring peep sight. I do not find it gets in the way because you should not be wrapping your thumb around the stock. Some shooters use a semi or full buckhorn rear sight as semi peep sight, others prefer a flat rear sight and just have the bead over the top. Whatever floats your boat.
I like the tang sight so I can "see" the whole target.