Right but the unstated assumption that there is no other positive path isn’t any more well-supported than the converse. For example, observe the variety of life

Right but the unstated assumption that there is no other positive path isn’t any more well-supported than the converse. For example, observe the variety of life we have locally. I’m thinking particularly of the various life (or life-like but I digress) that exists in extremes like thermal vents or under-explored places like deep soil. So maybe it does eliminate 1/10 but maybe we forgot to add the other 1/10 for life that wants to live at 100C (or whatever) — I’m pushing back on your assuredness, not the math.