I’m not really sure why you’d call it invasive. It would change nothing about the way Lilypond works, but just add power to the input language.
Your points about beaming and grouping are reasonable, but the idea is not replacing tuplet with such a notation, but making such notation easier. And there are many cases where the default grouping by beat structure is pretty much what you want. In the worst case one can simply group the notes manually, which is still much faster than doing lots of different tuplets and hiding the Brackets (if you do a piece that frequently changes between division 2 and division 3 this takes a stupid amount of time!) Cheers, Valentin
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