“It is an almost religious issue if you use breadcrumbs or taters..”.
I can secondthis for Germany, discussing meatball recipes is entering sacred ground.Breadcrumbs on the end have won over for the southern part as used in manyother regional dishes.
A typical regionalrecipe would be: minced meet - 1egg -1 fine diced onion - chopped parsley - fine breadcrumbs.
For a glutenfree recipe, I too would tend to pure oatmeal or taters.