I have been saying it all along.........
when manufacturers made a deeper tub, they never raised the fins of the agitator, they only raised the center post up about 2 inches, and I always thought that the agitator should have increased the fins to accomodate the larger load.....the dual action is the only one that did this with the spirals raising up with the tub....and GE did raise the top part of the fins but the bottom should have been increased also....
but I can remember my mothers GE 1964 V-12...where the vanes decreased as they got to the top, but that machine could handle any load, sheets, bedspreads, work clothes, or a heavy towel load, and it just seemed to be best at water extraction compared to a whirlpool....I just never realized how great of a machine it was until we got rid of it....because of all the many features of todays machines, all I ever really use is normal wash, warm wash/cold rinse, high fill level, and maybe 1/2 size on ocassion...for every load....don't need all the gadgets...just the basics....her only complaint was I didn't have perm press cycle(which really didn't need) and the filter flo always left a lot of lint behind, compared to my aunts whirlpool self clean version....