It isn't an either or, it is just that fine tuning a solid position is a more lasting approach than getting a note in tune "any old way" out of the gate. Anyone who thinks getting their hand right is all it takes is not correct - same goes for thinking that all it takes is being able to sing what you play.
What I do think is that one order is better than the other and building a solid position is the by far the best step one. Being able to play in tune with your hand any old way is a really, really tough habit to break and will cause a lot of trouble down the road in terms of up tempo playing and other situations.
Honestly, I'm not disagreeing with you, but I just keep seeing Niels-Henning Orsted Pedersen playing Donna Lee with Joe Pass in my mind's eye, and think, "hmmm, more than one way to skin that cat."
Actually, now that I think about it, while I agree that building a solid right hand is important - except maybe for NHOP, Rabath, etc - I still think learning to sing the pitches will only improve your intonation because it will "inform" your hand when its correct. So I guess I do disagree with you. Plus, you used a straw-man argument because no one had recommended NOT learning a solid LH previously. Students could do both at the same time - except according to you that's not the best way. I suspect I won't have to look far to find another expert player to contradict you.
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