This video is only a few years old but should already be considered a classic. Not long after, the video's creator was hired to lead design of MuseScore (another sheet music desktop app). I find the world of music notation software to be fascinating in its diversity of design philosophies. Something about music notation — its complexity, plus its worldwide ubiquity, plus the business reality that there's (relatively)…
I would hedge that's the majority of the world doesn't learn or doesn't care for Western notation to be fair.
That's 100% true for classical, jazz, marching band, etc. musicians, but also for musicians in "pop" genres.
Even folk/ethnic musicians around the world, with a few exceptions, are more common to use western notation than their historical notation (if available). If they gig and work with studios and orchestras, that's almost a certain.