On the topic of why, here’s a real WHY:
Why do all Gemarahs have “Talmud Bavli” printed in the front cover, while the Mesechta on the side? Ever wonder? Going around in a Bais Medrash, don’t you notice? Isn’t it utter silliness? You spot a Gemarah on the table, you have to look on it’s SIDE to see which Gemarah it actually is. How silly. I know it’s Talmud Bavli, they could have put that on the bottom in small letters. Isn’t it more beneficial to put the Mesechta in the front?!?
Oops. The printer didn’t think about that…