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Quoting the this page [1] :

"One reason why none of these alternative notations has caught on is presumably that it takes a lot of time and effort to learn a new notation system. Not only professional musicians, but also musicologists (including music psychologists and music theorists) invest enormous amounts of time learning to read conventional music notation. Understandably, they don’t want to have to start again from scratch. So they tend to avoid the problem of conventional notation’s shortcomings and the evaluation of alternatives by regarding the problem either as irrelevant (“conventional notation obviously cannot be improved”) or impossible to solve (“it is clearly impossible to decide among the many possible alternatives”)"

[1] http://web.archive.org/web/20200925170150/musicnotation.org/...