I'm a bassist, of the "don't quit your day job" variety. Owing to the accident of having a certain musical background, I'm a fluent sight-reader, and the groups that I play in require this skill. I frequently encounter a mixture of standard notation (SN) and chord symbols, plus the occasional Nashville number chart.
From what I can tell, people have explored different notation systems for a couple of reasons. The first is that SN is an entry barrier for beginners. The second is to express musical ideas that don't fit within the bounds of SN.
But in my view, the reason why SN remains in use, is that there's a symbiosis between composers who can write it, and musicians who can sight-read, i.e., perform it directly from the sheet. Tabulature, or other pictographic notations don't work because the composers don't intimately know all of the instruments that they're writing for (including the variety of tuning and fingering systems for each instrument), and nobody knows how to sight-read those notations.
Another issue with any method involving computer graphics, is that there are still a surprising number of composers who use pencil and paper, because notation software is so cumbersome.
In one band that I'm in, the composer brings new material to each rehearsal. It's all written out by hand.