I think this is part of it. I also think that humans are essentially greedy when it comes to progress. I am fortunate to have a nearly limitless supply of cle

I think this is part of it. I also think that humans are essentially greedy when it comes to progress. I am fortunate to have a nearly limitless supply of clean water, at nearly any temperature I want. Yet I still curse the shower for taking a minute or so to warm up. It just is never good enough, moving the goalposts as you say.