The author should really move to Japan if they’re so impressed. Then they’ll get to find out what things in Japan no-one gives a shit about, and the shine will wear off.
But actually, I like a lot of aspects of the United States, too, and I also wish more people gave a shit here. They're clearly speaking in hyperbole but I think the overarching point rings true; less people give a shit than you'd hope. Hell, I struggle to give a shit some days.
I say this as someone who loved being there but can't quite afford to go back and see my friends who are still inviting me to visit again.
In terms of permanent residency, I think that Japanese culture Does Not Care about employees' work/life balance. The USA is working hard to catch up here so that's only a temporary gap.