It’s not just about flavor, but it is about flavor too, it’s about canned, prepared food with preservatives and whatnot. I try not to use too much in the way of already prepared food (don’t worry, I eat my damn fair share of it) but the classic green bean casserole is super easy (not) to recreate without the use of preservatives and cans of already prepared things.
Not that I would’t happily eat the classic: Canned green beans, Campbell’s condensed sodium bomb and the even-saltier French’s french fried onions. In a heart beat. But my version will taste way better.