It seems silly.
I can drill 4 dowel holes using any of a number of jigs, but probably the Rockler jig, in less time than it takes to drill two pocket holes, drive in two dowels, trim and sand.
With the dowel jig, it is drill 4 holes. Use any of the manufactured dowels. Glue and clamp. No sawing to size. No sanding smooth. No visible joinery. I don’t see it.
I have the Rockler in 1/4”, 3/8” and 1/2” sizes. The operation is identical for all of the sizes, only the dowel diameter changes.
I would agree, however that the dowel adds more structure than the pocket screw does.