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Any kind of organisation at semi-galactic scale implies FTL communication at the very least, which violates everything we know about physics.

Another theory that doesn't require a great filter: The distribution of life may not be equal across the galaxy if it's truly random, we could be in a local minima and never meet another civilisation by the bad luck of where we are.

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> Any kind of organisation at semi-galactic scale implies FTL communication at the very least, which violates everything we know about physics.

Never thought of the practicalities of that, so thanks for bringing it up.

I think you're overstating things. Sure, they wouldn't be able to watch the Superbowl at the same time or hold elections in the same decade. It would be a very different and slow moving kind of civilization than what we know.

But I don't see how that means it can't exist, in some form.

"by the bad luck of where we are"

Or perhaps the good luck of where we are

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