Note to myself:
Feedback on normal, simplify snaps > reduce graces > reduce 1/6 RC
Hard, less chords > more compact spacing > better progression between Normal + Insane
15/8/21 hopefully done
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According to #2536317 , NM diff sometimes intentionally ignored the diff-specific guideline in Normal about "Note snappings of consecutive 1/6 and above should not be used. Slower rhythms are more appropriate for this difficulty level.".
Considering there's no additional notes nearby 2~3 consecutive notes applying 1/6 or any above snap, I think that guideline can be ignored in this case.