I did the same thing to that agitator years ago when I tried it out in one of my 'Tags. Maytag needed something on the upper agitator barrel to pull clothes to the bottom to help with circulation, but those 4 insipid fins were not the answer.
And as to why they eliminated the lint filter in the agitator: The no phosphate detergents did not buffer the water as well as the "real" detergents that preceded them. Everyone was having mineral buildup and the lint filter was where Maytag owners saw it first. It was easier to remove it from the agitator and put those two little mesh covered openings under the agitator to catch lint because nobody would notice when they became blocked with minerals. Truth be told, much more lint is removed & caught by the dryer anyway.
And as to why they eliminated the lint filter in the agitator: The no phosphate detergents did not buffer the water as well as the "real" detergents that preceded them. Everyone was having mineral buildup and the lint filter was where Maytag owners saw it first. It was easier to remove it from the agitator and put those two little mesh covered openings under the agitator to catch lint because nobody would notice when they became blocked with minerals. Truth be told, much more lint is removed & caught by the dryer anyway.