It should be possible to create a 4-tuplet even when it is technically possible to create the same rhythm without a tuplet.
For example, it is POSSIBLE to divide 5 8th notes evenly into 4 groups of 5 32nd notes, but the result is difficult to read and understand, whereas the 4-tuplet neatly expresses the musical intent.
The same is true for 4 over 3 or dotted 8th notes. There are plenty of situations where it might be easier to read if the rhythm was written as a four tuplet rather than as 4 dotted 8th notes.
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