re: 9+6 = ? "Our young learners might not be altogether comfortable..."

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I can do fairly complex calculations in my head and that is exactly the method I've used all my life

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So do I, but it's overkill for single digit addition and I don't see where you'd save time later by learning this with single digits now. It isn't efficient.

Just learn to add single digits like that on the fly, and the process by which we do more complex problems in our head can be learned a couple year later (as it already is)

9+6=15....why do we need a new concept with more steps to learn this?