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> The latter two points might turn out to be extremely rare events.

Are those events that crucial for life?

No, but they are crucial for the shift from sea to land.

without the moon, earth would likely have become a tectonically dead world a few billion years ago.

Why? Something to do with tidal influence on the core?

I'd also like to know. I supposed there must have been a lot of heat from the initial impact, tides must also happen inside the Earth, but I wonder how different the Earth would have looked like techtonically without the Moon?

No plate tectonics? So perhaps resurfacing event(s) like on Venus?

I suspect this is what the GGP was getting at:

https://www.discovermagazine.com/the-sciences/the-moon-our-s...

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