It sounds like a good idea. What are you thoughts on this?
That's what I thought too, but having had to clean my KA's disposer twice (a real PITA) and replace it once over the course of 18 months, I don't think so anymore. I can only speak about KitchenAid (and the associated Whirlpool and Kenmore models). Perhaps other brands have better arrangements, I don't know. It's not really a food disposer; it's a rather cheap chopper and screen assembly (see link below), and if you're not careful about what solid foods remain on your dishes, it will clog and prevent adequate water flow from reaching the upper rack. Moreover, it will take some of the semi-chopped solid food and actually make whatever's in the top rack dirtier than when it went in. I've learned to carefully scrape every plate before it goes in. Mine is less than 2 years old and works reasonably well otherwise, but when I eventually replace it, I'll avoid a built-in "disposer".
Here is a link that might be useful: KitchenAid Repair/Chopper Replacement
KA is considered the best DW with a hard food disposer.
My whole life has been with DW with disposers. In fact, I never even knew they existed without one until I came here. I've never experienced nor had anyone I know experience issues with them. Now that I understand from my time here that DW's without them make a generally quieter unit, I plan to look for one without the disposer when I buy my next DW.