[tripa]

Sorry, that wasn't my point but I haven't made it clear.

432 vs 440, independently of any unit, makes the math easier.

432Hz vs 440Hz, obviously, is two pitches that form an audible interval.

But 432 can be a valuable explaining tool. Just don't read it as Hz, but Hz' (prime), cycles per s', such that 432Hz' = 440Hz.

That's about as far as I'm willing to defend 432.