Computer programmers years ago wrote code in editors (same as current music sheet), but quickly with the advent of the GUI (graphical user interface), each of the languages had IDE's (integrated development environments) which visually make language components virtually jump out of the page by using color, bold and italics type and indentation.
When applied to sheet music, such conventions would revolutionize the craft.
You'd think with all the electronica in music (EDM, MIDI, etc.) some advancements in sheet would have happened by now. I suppose the numbers of people that would actually have a need for this is so limited, nothing will change.
That's a fascinating analogy: not even full IDEs, but most good text editors will automatically color syntax for programming languages based on what the editing program infers (which language, etc.). I wouldn't know how to devise some kind of similar standards for notation software, but even an ad hoc system for personal use could be interesting for those with the time or interest.
I'd bet using notation/engraving software is a bit more widely used, though, than one might think: especially the free or low-cost ones. Compared to handwriting bits of scores, for me, they're nowhere near as fast, but much more flexible when it comes to editing or making interesting reductions of complex pieces.
You know, once you input, say, a fugue of however many voices, it's trivial to isolate, say, the soprano and bass voices, and print out a "mini score" if it's too tricky to untangle the voices by looking at the published score, or if you just want to take a different visual presentation for any reason..
Or just collect snippets of pieces you need to woodshed and print them out onto, say, a single page (probably my favorite method: sort of takes away the temptation to keep fumbling through a piece just for fun).
It could be useful, especially if you can figure out how to make something like MuseScore display the stems to your liking.
I would think nothing really beats just penciling in easily-overlooked accidentals. Or perhaps just a decisive stroke of a highlighter.
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dogperson: thanks for the tip about erasable highlighters! I had no idea. That sounds like an incredibly versatile and useful bit of equipment.