re: Planes over mainland USA now

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(RVSM) actually exists to avoid collisions.

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Ummm, no

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Depends on how you look at it. It's purpose is to fit more crossing traffic into a tighter airspace. RVSM is an efficiency thing at it's core.

I don't thing he's wrong in saying it exists to avoid midair collisions in that only RVSM capable aircraft are allowed in RVSM airspace.

I know there are exceptions. I've flown above 290 in a Non-RVSM old arse C-130. All I had to do was say "negative RVSM". It was a Sunday and we were light.