I see where you are coming from. Though I think the Japanese government doesn’t have to play a hand in promoting such a minimalistic culture. I mean it has been suffering from stagnant wages n stagflation for decades. People naturally acquire a scarcity mindset and give up on material possessions.

I think it isn’t so much the exact amount of things, but whether you keep each item in its designated place and are able to use it conveniently instead of letting it gather dust and sap your mental energy