It’s so funny you’re being downvoted, i think it’s just an expression of how much people hate oatmeal and like milk, lol. And also you can pry my milk from my cold dead hands.

Full fat milk is probably better because a) it will taste better and b) the fat will slow the energy release.

That's what I do, my son often comments that I eat gruel for breakfast.

What a lot of people don't realise is that the creamy texture comes from the oats rather than the milk.