Lbs usage in the USA is mostly for commercial machines
Here in the USA about the only time one hears a reference to pounds/Lbs of laundry is in the commercial laundry industry and their commercial machines.
It is mentioned in home machines sometimes as a test load, or in the boil-plate of government specs like my link farther up the thread. It really is not used at all for the average home user.
In researching buying a new FL washer recently, I looked at all the brands available locally and downloaded spec sheets and sometimes even repair manuals. Salesfolks who hawk these machines might as well use made up SciFi terms like Centons than use Lbs or Kgs to hawk washers.
Even in a General Electric spec sheet for Commercial washers and dryers for laundromats, the sole metric is mostly cubic feet.
On page 11 of the PDF in the link; the FL unit in the lower left says:
Capacity (cu ft.) = 16 pound (2.7 -3.1 per IEC)
16 Lbs is 7.26 Kg
In the USA there really is no reference to Lbs or Kg with home washers sold here, the metric is cubic feet. It is the primary metric, the 2nd largest number in the Advert, the 1st being price.
I really cannot remember every hearing or seeing an advert where Lbs is mentioned in the last 50 years in the USA!
It might as well be like as rare as in Australia or SA cars were hawked in capacity in Firkins. ie an old unit for butter, ie 9 imperial gallons. (10.809 US gallons).
Imagine if you washers were magically sized with mass in stones or grains , or volume in Firkins. The masses of home consumers would be confused!
****** Is the USA the only place home washers are hawked by volume for Capacity?
http://www.geappliances.com/commercial_laundry/catalog2007.pdf