It doesn’t have even intervals between the strings. In standard tuning the strings are 5 half-steps apart except the B string, but that allows the high E to not be an F. It’s fairly intuitive to have the intervals be even, and there’s limited wonkiness in the finger position for many of the chords you’d normally play.
Drop D is nice if you want open power chords with just the 3 notes, but it doesn’t address other strings. It makes the interval between the bottom D and the A string two half steps further than the interval between the other strings, which makes playing stuff besides power chords less intuitive.
Open D would give you open major chords across all the strings, but then the intervals between the strings aren’t nearly as even as standard, and it doesn’t help you with playing anything but major chords.
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