Same period that National Geographic and Reader’s Digest shifted. All started to occur around late 1990s.
Go out and ask people when was the last time that they looked at any of those three magazines. Each has lost a large segment of their base. I haven’t touched a Rolling Stone since 1998, and NG/RD since around 2004.
I gave up on NG in the late 90s. It was tough, I’d had a subscription since the early 70s.
Same thing happened with Scientific America. I stopped my subscription in '95. The articles became dumbed down and started a massive left wing slant.
You haven’t seen National Geographic since 2004?
Then you missed the Michelle Obama centerfold.