Your opinion on this resembles a blind person who has never painted deciding that painters could use 5 primary colors instead of 3. Or, maybe we should make do with 2 because it works out cleanly.

12 note octaves are not ‘utility’, it’s how almost every single piece of music you’ve ever heard was constructed. Breaking the octave into smaller units creates sounds that are off putting and unfamiliar. Check out ‘microtonal’ music. There is also Indian music that uses divisions like 20 per octave.

It seems your analysis and suggestions are based purely on mathematical concepts of this notation. However, it’s not useful to consider this this notation divorced from its implementation.