All tabbed shingles need to be installed with vertical and horizontal lines in order to keep the key ways straight. Certainteed for example allowed 3 tabs to be racked or staggered, but for the higher end tabbed shingles, grand manor, carriage house, Belmont, racking is the only recommended method of installation. I have seen many jobs look horrible from the installer not racking the shingles.
There are a lot of very experienced people on this forum. As long as 3 tab shingles have been around 60-70 +Years? Racking was the recommended and preferred method of installation for a quality job. It was not until dimensional came around that staggering shingles came to be. Maybe you do have a brand of 3 tab that requires to be staggered, but I have personally never seen that. In my opinion Grand Manor is one of the best, if not the best asphault shingles on the market and I would never think of installing them any other method than snapping vertical lines on the roof and racking the shingles.