I still think that “lifeless rock” does not specify how lifeless - theoretically extinct or just lifeless enough to make human life either extinct or just miserable. I took it as the latter, and in that case even lesser cases than 75% of all species would suffice.

The first case, the theoretical and non-human focused pov is quite another thing. Like you said, there’s so many opportunities and adaptations for life to seap through the combs of doom :)

75% estimated extinction rate is quite close to me. :)

I feel offended - W%W-%w is my preferred way of noting down dates :D