The "lint filter" under the agitator does very little in terms of catching lint that has been released from fabrics while washing. Most of those passive lint filters were simply for advertising value and if you've noticed, very few, if any machines even list a lint filter in the features. In fact, the WP's now use four little rubber plugs in the holes under the agitator that must do little more than slow down the already tiny water currents between the tubs. The detergent's suspension agents should be good enough to hold small amounts of lint in suspension in the water until it is removed from the machine.
Which brings us to spin-draining vs. neutral draining. There are certain advantages to a neutral drain - it gets the load settled lower in the tub which will usually balance better than clothes that are spun up onto the sides of the basket. The trade-off, IMO, is that all the dirty wash & rinse water are strained back through the load far more than with a spin drain. Think drip coffee filters. Many times, you can open the machine and see suds & debris (hair, etc.) lying on top of the load. WP/KM used 4 sprays after the wash and rinses to flush away this crap in the belt-drive machines but I guess decided it wasn't important in the DD's. I guess the dryer can remove that stuff. Now, if you get any spray-rinsing, clothes up on the sides of the tub will benefit more from this spray than lumped at the bottom.