[zharknado]

Music major and vocalist here. Seems like the problem is framed as “mapping dots to pitches,” which is a pretty good reduction of what notation does but glosses over some things I value in standard notation.

C4 and C5 are not the same. Singing them well requires different techniques, as would playing them well on some instruments. So it doesn’t really bother me that they’re “different” in relation to staff lines (8va and 8vb notwithstanding).

More importantly, knowing which scale degree you’re on (in relation to the key) is valuable for interpretation; it has implications for where the harmony is going. Likewise knowing how you function within a chord. If you’re on the third in a diatonic triad, much less volume is required for good balance with the other parts on the root and fifth. Even more so for sevenths, seconds, sixths.

You could argue that just listening carefully might allow you to achieve a similar balance by adjusting on the fly, but one advantage of being a skilled music reader is that you can make interpretation decisions before you execute them, even if you’ve never performed the music before.

Edit: clarified difference between scale degree and function within chord.