The problem is not the disruption introduced by page turning, that you hint to in another comment. You're ignoring that notation is optimized for both melodic and harmonic content and how quickly you can grab both; and music is not constructed from notes, it's constructed from scales.
Irregular spacing is a feature, not a bug, unless you're playing Schönberg and friends, because being able to quickly separate thirds, fourths and fifths is much more important than being able to grab octaves and even more important than identifying individual notes.
Your brain anyway doesn't have to work on "it's on a line therefore it's one of C D E F# G# A#", it very quickly learns to work on "it's on adjacent lines therefore it's a third apart" when you read sheet music. Two notes both on lines or both on spaces are part of a triad; "two notes very far apart, one on a line and one on a space" is almost always an octave, and you can grab that intuitively in standard music notation even without reading the two notes one by one; whereas smaller intervals are simply too far apart on isomorphic notation.
Same for understanding when your scale is changing or you're deviating from the normal fingerings (key signature vs. inline accidentals). And all this ignores the fact that G# and Ab aren't even played the same on some instruments, at least at an advanced level, and chromatic notation cannot capture that.
Irregular spacing is a feature, not a bug, unless you're playing Schönberg and friends, because being able to quickly separate thirds, fourths and fifths is much more important than being able to grab octaves and even more important than identifying individual notes.
Your brain anyway doesn't have to work on "it's on a line therefore it's one of C D E F# G# A#", it very quickly learns to work on "it's on adjacent lines therefore it's a third apart" when you read sheet music. Two notes both on lines or both on spaces are part of a triad; "two notes very far apart, one on a line and one on a space" is almost always an octave, and you can grab that intuitively in standard music notation even without reading the two notes one by one; whereas smaller intervals are simply too far apart on isomorphic notation.
Same for understanding when your scale is changing or you're deviating from the normal fingerings (key signature vs. inline accidentals). And all this ignores the fact that G# and Ab aren't even played the same on some instruments, at least at an advanced level, and chromatic notation cannot capture that.