055166k, to add to your history lesson, when the inbound routes were changed off R8 to go south of SAM, the FL270 was kept due to the outbounds via GIBSO climbing to FL250, FL260 would be logical for the inbounds however this used to be the standing agreement for BB/BE/NX departures going south through SAM so FL270 stayed. It was only about 5 years ago the BB/BE/NX agreement was stopped!
Hempy, that is exactly what should happen if the restriction is still required.