I am a drummer, I do not play any melodic instrument, though I happen to read some piano scores, and I am wondering what was the idea behind using the bass clef for the left hand part. From what I understand, if the left hand part of a piano score was using the treble clef, every note would be below the staff, making it unreadable.
However, why not just simply invent a musical symbol involving a shift ? Like, a treble clef with -2, meaning 2 octaves lower. What was the idea behind using a different clef between the right hand and the left hand ? As first sight, it makes everything unecessarily harder to grasp.