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"Pretty shitty how baseline human activities like singing, dancing, and making art got turned into skills instead of being seen as behaviors, so now it's like 'the point of doing them is to get good at them' and not 'this is a thing humans do, the way birds sing and bees make hives.'"
That's a good question. Personally, I think it should but I am pretty sure I've seen it classified as playing an instrument once.
I guess it's really no different than a flute... I also can't play a flute worth a shit as well as whistling so yeah. Makes sense as an instrument.
Whistling has a lot in common with other wind instruments as well. Oral cavity control, resonance, air use and ear training etc. Just the vibrating element changes and you'll have a tool that provides a resonating air column and projection and other things. And music is music, of course. That's overlap in itself.