No it's not esoteric, but it's mainly common in jazz & oldies.
Just try it on your arranger:
CDEG gives you C add9. So does CEGD, GCDE, etc. No inversion changes.
If you try C13 (dominant 7) the chord will be recognized as either Bb /C, or GM7-11, but no inversion changes.
Why? Not sure, probably because arrangers were first created with ABC (auto bass chord) from organs, which meant it read the chord from your left hand, and you can't generally do more than 4 (or 5 with an add9) part chords with 1 hand. So they didn't bother with 2 handed chord recognition. But now that keyboards aren't confined to 61 or fewer keys, maybe they should.
Keep in mind, the accompaniment is also programmed with typically 3,4, or 5 note chords, so even if you successfully could read 2 handed chords, the accompaniment still only has these to draw notes from.
But let's be honest; if you're playing a C13 with 2 hands, and the accompaniment is playing either Bb/C, Gm7-11, Gm7/C, or even C7, you likely won't hear the difference under the actual notes you're already playing. As long as they don't *add* notes outside of the scale you're in, it will still be in harmony.