Probably an eulogy for openness to experience? Perhaps the best example on the thesis of this article is how climbing Mt. Everest, while making you happy by simply climbing it, you also get "psychological richness" when you get that sense of fear of fucking it up and the adrenaline that comes with it.
However, their mention of war is a very scary mention; sure, the Greatest Generation essentially created modern institutions and culture after WWII that are still up to this day - even after CRT and related that wants to destroy it.
And yet, if us zoomers ever went to war, which is probably the implication here (2021/08) and is already happening with Ukrainian and Russian zoomers right now, I don't believe we will have the creative spark that the Greatest Generation had on the basis of how easily manipulated, addicted to technology, consumeristic, unmotivated and unoriginal we are.