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I don't think that's a good analogy, all those waterfalls developed independent of each other.

As far as we know all life is related and has the same ancestor. Even on earth the emergence of life seems to be a freak accident.

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Sigh. Analogies are hard.

I don't think this is just a limitation of the analogy, but it is the key point: for any structure where we know the process that forms it (like waterfalls or snow flakes), we can have some informed opinion about the chances of it happening elsewhere in the universe, even if we have only observed one instance of it happening.

However, for structures where we have no idea of the process by which they are formed (like cells), we can't have any opinion on how likely they are to happen elsewhere, unless we see more examples.

I think we know more about abiogenesis than you are giving us credit for.

We know a few things about the formation of organic compounds that life uses from inorganic compounds, and how some specific organic compounds crucial to life appeared, but not much more than that. Nothing even close to the formation of a simple self-replicating cell, for example.

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