That's the is-ought fallacy. We know humans can survive on many different levels of oxygen saturation, and it's clear that very high oxygen content is sometimes helpful. We are not "adapted for ice caps", and they are clearly not a requirement for our survival. Sure, ice caps help maintain Earth in a climate that is favorable to us, but think about all the many different climates that humans have existed in for thousands of generations. There's no real reason to assume ice caps are necessary for a favorable climate. Not to mention the fact that ice caps seem pretty common in the universe.
Similarly, the ozone layer is not a requirement, the requirement is that we have some protection against harmful radiation. I don't know how many different possible ways there are to produce a world with minimal UV light, but I'm sure it's more than 1. And besides: are you seriously suggesting that Earth is clearly optimally habitable regarding UV light, when a large percentage of all humans have to take active measures to protect their skin from frying every time they go outside for more than 30 minutes? It's actually very easy to imagine worlds where it's much more pleasant to be outside.
Why would you even think humans require tectonics, vulcanism, and erosion? This is the most obvious is-ought fallacy. Humans cannot live on a planet unless it has earthquakes and giant death-gas-spewing lava mountains? What?
Abundant fresh water I'll give you. This is something that all our evidence suggests Earth is definitely S-tier at, and rare in our neighborhood of the universe.
Similarly, the ozone layer is not a requirement, the requirement is that we have some protection against harmful radiation. I don't know how many different possible ways there are to produce a world with minimal UV light, but I'm sure it's more than 1. And besides: are you seriously suggesting that Earth is clearly optimally habitable regarding UV light, when a large percentage of all humans have to take active measures to protect their skin from frying every time they go outside for more than 30 minutes? It's actually very easy to imagine worlds where it's much more pleasant to be outside.
Why would you even think humans require tectonics, vulcanism, and erosion? This is the most obvious is-ought fallacy. Humans cannot live on a planet unless it has earthquakes and giant death-gas-spewing lava mountains? What?
Abundant fresh water I'll give you. This is something that all our evidence suggests Earth is definitely S-tier at, and rare in our neighborhood of the universe.