I beg to differ. Just a bit of honey and milk make 'em fucking delicious, and if milk and honey are complex seasoning, something is very wrong with your ability to cook.
Chinese person here, the spices that work well on rice also work on congee, which is already similar to oatmeal, and IMO they work just fine on actual oatmeal too.
Hell we even have a “lazy congee” where you literally just add leftover rice to hot water to make a sort of rice oatmeal. Super convenient in the morning when you’re in a rush!