flying altitudes that there is no chance in hell of holding the MEA OEI - That is legal and why we have drift down charts

flying IFR into airports that have only a GPS IAP - Again, legal, even if there is NO approach. See "Cruise" clearances: Cruise clearance. An ATC clearance issued to allow a pilot to conduct flight at any altitude from the minimum IFR altitude up to and including the altitude specified in the clearance. Also authorizes a pilot to proceed to and make an approach at the destination airport.