OJ, that's an interesting article!
It motivated me to look at ebay, just to find that there are practically none of the good keyboards left.
You can recognize the 1980s AT ones as they have no flat surface like the modern ones.
Instead they have some bar/stair/step (don't know the right word) above the F keys, and this leveled frame around the keys.
Their feeling was like those in POS register cash keyboards - high keys, longer travel than the modern ones.
Just the right ones for "hammering" the keyboard.
What nowadays commonly gets sold as "vintage" cherry keyboards, I consider as the "new" ones, which I do not like much.
And they got even worse over time, as said.
I found only one of the old 1980s AT keyboards, but as OEM variant.
It differs from the normal ones that the blue keys were grey.
Here is
the ebay link. If the price weren't that crazy, I'd have ordered it instantly.
Even better were the PC/XT ones. They were even stiffer, and still had a metal plate, so mine survived the treatment it got.
Here is
one of these, an OEM variant, too.
I feel a bit sad that I threw my one into the trash long long ago, as the scancodes are incompatible with the AT ones.
Nowadays one could compensate for this with a X translation table...
Edit: I never saw the "soft" variant (probably that what gets sold as "red") before about 1995. My unqualified guess is that they attempted to adapt to the feeling of cheapo keyboards imported from the Far East.