Correct, to an extent. The Maytag does have a small removable filter, but will only catch large items. For instance, I have never had anything found in my filter. So a majority of items are pulled right through to the filter. The Maytag does have a '4-Blade Chopper', but won't really do much. The filter that matters the most is behind the chopper and is not able to be cleaned. 

Though, I will say, I would not hesitate to recommend this machine to someone. 

Honestly with today's machines and detergent I see little need for a chopper any longer. My last few DWs had one but it did not improve performance much. My current KA does nor have one and it out cleans anything else I've owned. All I do is a quick scrape if that and out come spotless dishes. Of course it is a quality DW, as are Bosch and others and not low end- that's a different story.

Modern detergents  NEED dirty dishes.  The  various cleaning agents cling to the left on food and dissolve it.  If you rinse or clean them too well performance suffers.

I put stuff in my KA just lightly scraped if that, and only need to clean my filter once a month or so -if I think about it. Only use Cascade P+ pods and rinse aid.  Spotless loads every time.

It may come down to the fact I don't focus on the filter.  I may glance down there but if there is only minor stuff down there I know from experience that it will dissolve and be washed away. I if physically checked it every load odds are I would find something, just as I did looking at the chopper in my old GE.  There is always some food remains somewhere in any DW.