There is no, and never has been, a requirement for a 20A receptacle or circuit outside. There is a requirement for dwellings that you have to have a receptacle at the front and back, (accessible from grade, w/exceptions), but doesn't have to be on a separate circuit and doesn't have to be 20A.
Unless there are a lot of outdoor receptacles wanted/needed. I just come off of an area that allows it, such as living room, bedroom, garage, etc.
Of course, it would have to be GFCI protected. With today's requirements for AFCI and GFCI, I usually just use DF breakers. So the outside receptacles would be covered for GFCI.