I do not know what aircraft AF
is using on WAS (Washington?) - CDG
and back but, if you are in Y on a 777, 10 abreast for such long flights is really a p... in the a....!
During daylight flights, it could be OK
but not on a night flight!
I'm travelling once a year on CDG
or another route to/from USA and even if it's for holidays and more expensive, I fly Y+ all the time : it's really more comfortable.