Yes moving the sprite will be WAY HARDER to do with this costume offset but once you figure out how to move the sprite while also keeping the offset code on the sprite would be amazing!!
This can help with a lot of projects, including maybe that you forgot to center some costumes, or you just don't want one of the values to be changed like for example being able to increase the size but stay in the center and also putting the rotation out of the center, making a cool effect of it rotating around an axis while changing size in that exact position!! I know crazy!!