Honestly, laziness.
NIP44 (used in NIP17) is a different encryption scheme. It's a little harder to implement (and I say A LITTLE, because honestly any competent developer should be able to build it).
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I’d love to just use KeyChat but you never even know if your recipient will see your message because it isn’t backward-compatible.
I implemented it into Bloom in like 10 minutes it's not that hard
I suspect there's also a lurking suspicion that NIP17 is not the solution so may as well take a pass on it and wait for the next thing. and on nostr there's always a next thing.