I agree with your comment a lot. Don't think of me as a nitpicker, I simply want to add a nuance to this statement:
> Reminding yourself of everything you could lose drives some appreciation for what you have, whatever it is.
I have observed many people having trouble with that and I agree with you that this is very much needed in our lives to give us some humility.
That being said, to some people -- myself included -- this happened way too many times and they can't have appreciation through that vector anymore. My brain switched to "I am sick of hearing this! I will level up and won't have to think about never being threatened with living under a bridge ever again!".
Of course, the hedonistic treadmill the article mentions is very much real -- we are never satisfied with what we have. However, it's very possible to arrive at the mindset where you are like "eh, I'd feel a bit better if I had a $500K in the bank and not only $200K" but objectively, when you've grown up and lived in a poor country for most of your life, I think it's easier to NOT get stressed about the statement in quotes.
And I agree on the evolution part. I'd theorize this mindset of ours has evolved because we developed in a very harsh environment (ice age) and we wanted to optimize our lives for less work and more leisure. Ironically, nowadays humanity at large fails miserably at just that... but that's really a very different topic.