The standard of football outside of the top leagues would probably go up if heading wasn't allowed. Not immediately (it would actually be a mess initially), but a few years down the line for sure.
Don't be shy on seasoning. You'd be surprised how good watery UK imported veg can be when roasted with some good olive oil (doesn't have to be extra virgin for cooking - just the right variety), salt, pepper and whatever protein you want. Throw in some fennel seeds or whatever and you're in for...