Many people do use feeding dishes, many people don't. There are advantages to a dish IMO which is why I use one.
I glues a shell to a magfloat and suspend it off the back tank wall. Keeps the bristle worms out and there population down.
I don't suck out extra food unless I have an algae issue, my peppermint shrimp come out at night and clean it off for me.
I do not turn off or even down the flow in my tank when feeding. The flow was designed specifically not to blow food out of the dish. Much thought went into the planning. Took a few trials, but is worth it IMO.
HTH