The linked article is actually more for older people since most millennials have no memories of such things. But a millennial or an older person who happen to find old books of Green Stamps can still redeem them for rewards in stores and catalogues, although it would take quite a few stamps to buy a new phone.
I liked the mention of Slide Rules, which I was never adept at using. But 20 years ago I saw an extensive collection of exhibited Slide Rules at a M.I.T. museum in Boston, and many of them were works of art.
Hmmm...brings to mind many, many things as pertain to younger folks & cluelessness nowadays=>
Cars without video screens ??
Sears, Roebuck & Co. ??
Neighborhood bake shops (is this where to get a sauna) ??
Butcher shop (a place to get a really cheap/bad haircut) ??
Captain Kangaroo ??
Mister Rogers ??
Printed books ??
Card games played with actual, physical cards ??
And soon , all the really young ones who will not know of Sears, Toy'r'Us & many such longtime icons which will have been gone before their times...