Yes(NO.... see below correction), I do believe that is wrong on the OEMs. The cross bars mount via hardware fastened to the grooves inside each of the side bars. They (crossbars) then can slide forward & aft in those grooves, or can be removed altogether via the same hardware (unless I'm terribly mistaken?). A quick check with the guys at HandA.com would verify this.Yakima bars using the Yakima Railgrab come off easy. The OEM crossbars are a lot more work to remove and install. That requires removing the siderails I believe. Correct me if I'm wrong. My OEM crossbars are sitting in a closet...I've never used them.
FYI, that fastening hardware also has small plastic loops built in for light tie down purposes I suppose.
EDIT: ......... OR NOT: It looks like it's not as easy as it would seem, if you review the assembly at H&A. I presumed too much.