Traditionally, I would guess that since back before recorded history, the one thing that all archers have had in common is that they all wanted to shoot the bow better than they did. I would assume this included anything they could do to improve the accuracy of their equipment and anything they could do to improve their own skills. Can you imagine a caveman hunter or an English archer before the battle of Agincourt saying, "Better not use the point of the arrow to aim with; it's not traditional, you know!"
In that sense, the compound bow and the crossbow are part of our same tradition of continually striving to find ways to improve our equipment. There is absolutely nothing wrong with deciding that we want to limit ourselves to a particular style of shooting or a particular type of equipment, whatever our reasons may be. But to do it because it is more traditional is somewhat of a misnomer, I think.