I've seen a number of systems that people have worked out, claiming they are simpler or easier to use than standard notation, but it turns out that they're simpler for the inventor of the system to use, mainly because the inventor has a specific instrument or type of music in mind. But they rarely give complete information and fail when it comes to music for other instruments or other genres of music.

I've had a number of people argue with me, since I play the guitar, that tablature is much easier system. But tablature is applicable to one instrument only. My wife couldn't play a piece of guitar music written in tablature on the piano, for example.

Or I can look at a song written in standard notation and sing it right off. Tablature and a variety of other "systems" are worthless for something like that. Lots of cello music can be played on the guitar right off the cello sheet music.

Most cobbled together "easier" systems rarely allow this kind of versatility.

Don Firth

P. S. Sharps and flats can be added to specific notes, and as Stu has pointed out, any sharp or flat in the key signature can be nullified by adding a natural sign before the note in question.

Standard notation has always worked well for me. And for millions of musicians.