Apparently pre-rinsing confuses the dishwasher or something. Not doing it leaves me with residue all over the other dishes though 🤷
As others have pointed out, it can be done albeit with more attention to detail than commercials imply. I wanted to mention the game changer for me was very reluctantly splurging for the expensive high-end tripple soap pods. These really made a big difference in my washer. I look for deals and buy them in bulk.