Just curious: The OP mentioned steel cut oats rather than traditional oatmeal. Did you mean the same as well?
The reason I ask is because, while I love steel cut oats, cooking a nice sized batch on the stove can be time consuming, and I don't like the 3-5 minute oats (precooked and/or steamed; lacks the same texture IMO, same reason I don't like standard oatmeal). I'm not sure I'd go so far as to use them in an Instant Pot, but it'd be interesting to read a second opinion of how they turn out.