I'm not sure depressed people, people that have recently lost their loved one, people with chronic disease, terminally ill people, people whose families are in active war zones, etc. think that that's enough for them.

I understand what you're saying, but there are much better ways to word that than this post did.

You're saying "be happy with what you've got" but that only applies to people that have the basic conditions for happiness that then lost sight of it in pursuit for more.

This generalisation doesn't work as well as the post, which says anyone can find happiness if they just look hard enough. Someone living in absolute misery can not simply turn a switch.