I have been following this for years, being both a sound engineer and a bit of a hippie who knows a lot of other hippies. The basic issue is that 432 is a numerologically interesting number compared to 440. So if it's more interesting it should be better for artistic purposes, goes the argument. However this falls flat as soon as you consider that the 432 is only interesting relative to the completely arbirtrary dura…
This isn't entirely true……
You're basically saying that because our measurement system is arbitrary, the numbers that are yielded as a result of our measurements are irrelevant. Sure, the exact numbers assigned to said measurements might be arbitrary, however the relationship between values still exists. As proportions, percentages, whatever. However you choose to measure, things still relate to each other in some way.
My understanding of the 432Hz conspiracy doesn't rely so heavily on the number "432" vs "440", so much as it relies on the correspondence between our vibration, the earth's vibration, and the vibrations coinciding with 432Hz. Again, rearrange these numbers any way you like, but there is still a relationship between the earth, us, sound, etc.