A blast from the past: id didn't plan on bringing the original Doom to the SNES and didn't think it was possible.
Another dev called Sculptured Software decided to reverse engineer a port on their own initiative and sent off the result to id, who were impressed and agreed to get it published.
https://gonintendo.com/stories/357322-john-romero-didn-t-think-doom-was-possible-on-the-snes-was-real