Happens every couple of decades or so. Some new whizz bang general thinks that they have the “right” idea for the next future battle.
Heavy down grades to motorized, then the next cycle it is motorized down grading to light and then it is light to augmented (with heavy) and then back to heavy.
It is all on the wheel
Ace Hunter said the same thing, it all goes around.
Remember, after World War II, many in the military intelligentsia were saying that infantry would be forever obsolete because of the A-Bomb.
I remembered reading that that quite ironically as I crawled into a draw while trying to avoid grazing MG fire on the DMZ in Nam.....