Perhaps, but how many do you think actually put in a new circuit with ground when they brought that pretty new washing machine home vis a vis those who used the 3:2 adaptor or just put a 3-prong outlet in the box in place of the two-prong?
Manufacturers just supplied what they knew would be needed for modicum of safety irrespective of Code. I can _probably_ even dig out of the file box in the closet a manual from one of maybe 50-60 years ago...Dad kept everything he ever bought and we've only tossed out a minor fraction as the rest is kinda' entertaining or history (or, in some cases, the item is still actually around and used, like the waffle iron that is original from 1947 when first got REA and off the 32 VDC Delco to AC service. I happen to know about it because had to rebuild the cord so had looked at the book to see if it had any 3rd party ID for old part number. Had some trouble finding a two-prong connector that still used the same-sized pins as it...but did finally locate a source so it's still waffling after all these years. :) )
Well, if I can remember long enough after I get up to look when go back outside...and no, the washer isn't outside, it's in the basement where the work clothes change room is.. :)