I don't like using the word "piano" for quiet, "forte" for loud, "retardando" for slow down, etc. I don't like using 7 letters and sharps/flats/naturals to describe 12 notes. I don't like using keys and clefs to obfuscate notation. I don't like demanding everything be Ionian-mode centric.
I offer the following improvements: Replace historic words like "allegro" with sensible replacements like "faster". Replace the 12 different Ionian-mode centric keys and "accidentals" with a single chromatic notation. Make a notation that expresses a wider range without relying on ledger lines, and ditch clefs all together.
And above all, stop rejecting every change that diverges from the status quo out of hand. Actually consider real changes, instead of worshiping the 17th century system we use today as if it's the epitome of perfection.