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Whimpy-ass chords. You need three or more notes for a serious(tm) chord.

Five for the Hendrix Chord, E7♯9 ;-)

That's E, G♯, B, D, F

Every jazz player knows you can drop the fifth, and the root too if the bass is filling it in. That gives your fingers room to add even crazier extensions

Oh man have you seen the Adam Neely video "Seven Level of Jazz Harmony"?

https://www.youtube.com/watch?v=lz3WR-F_pnM

If not, stop and watch it. But make a cup of tea to enjoy with it first, and maybe put a cloth over your keyboard for when you inevitably splutter tea all over it.

I read a pretty good argument once that this chord should really be called a b10 (no one does though...)

We seem to have a pretty hardcoded preference for using sharp in everything that's not brass and woodwind, don't we?

I think it's also ingrained that the chord starts from 3rd and 5th degrees so numbers above 7 are always adding in one of the other degrees. Or that a chord should have at most 'one of each'.

The argument was that this chord is unusual in that it's best thought of as having a second modified 3rd, rather than a #9 (raised 2nd)

The major-minor-7 chord is another example of the same degree twice... and we don't call that a maj-14 either

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