A bit of a tangent, but what I always found confusing about music theory is which parts are arbitrary historical legacy and which are fundamental to human enjoyment of music. 12 notes in a scale? Their particular frequencies? That whole multiplying and dividing business? Why the letters are in the wrong order. Why have sharps and flats instead of just more letters? I always get stuck wondering how much of this is jus…
Sharp and flat are only needed when moving outside or between scales, or using "fixed do", like modern western sheet music does with sharps and flats. Here is a discussion of the benefits
https://music.stackexchange.com/questions/41764/solfege-fixe...
For the record i prefer and use a numbered tin kay method like the article (but starting from zero rather than one), because it lets me abstractly consider what im playing, in much the same way as the above article