Surely we can switch off for a little while like a half hour and be fine why does everything just immediately fail if we don’t get oxygen? It’s such a design flaw. What is it actually doing to me that is so necessary I need it constantly?
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Oxygen is all around us in quantities that can be used for cellular fuel, but not high enough that it can hurt us.
And so as our multi-cellular ancestors evolved in that environment, they naturally harnessed the plentiful not harmful thing around them to grow more complex life. And now most complex life relies on that. Plants did a similar thing with sun. You could say “why do plants not grow in the shade, seems like a design flaw?” but the reason is that there were elements in the environment that made it advantageous for plants to grow in the sun, and so that’s how they evolved.
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