I have always used breadcrumbs (regular) and oatmeal (quick) in meatloaf or meatballs. Some Italians will roll their meatballs in flour before browning them. Makes the sauce a bit thicker, and holds the juices in the meatballs.
I use either breadcrumbs or quick oatmeal in my meatloaf. Hubby uses breadcrumbs in his meatballs. That is what his mother used. I don’t think he rolls them in flour; I will ask him to try that.
Thanks for the info.