Is there any point in adding steeped oats or flaked barley to an extract batch?
Unless mashed, both oats and flaked barley will simply add starch to your beer, causing a permanent haze. Boiling starch like that basically makes a thinned-out gravy.
If you want to add these you would need to do a partial mash.
It's a little more complicated than just steeping. Instructions are here.
If you go that route, we generally recommend toasting the oats lightly in the oven for flavor.