I think that people overestimate the Shibs technical prowess by a lot. They have shallow edges, poor extension, their posture is good but most of the time they look extremely rigid, they have poor ice coverage in comparison to V/M, P/C, C/B, B/S, W/P, and G/P, little variation in choreography during their FD, and they have extremely open skating (they are literally only skating in hold when they have to be and their hold are very loose. I would complain about this normally because siblings, but since they only skate in hold when they have to, it makes me believe it is a technical issue). They are good at a lot of things, not great. Better than Chock/Bates does not equal best in the world. The only thing that they are truly great at is twizzles and they typically score around the same as other competitors when clean because other pairs have difficult entrances, exits, and variation from year to year.
The Shibs do not have "shallow edges." They are very "quiet" on the ice (no flying ice chips), indicating deep/clean edgework. The ISU actually made an instructional tape for judges on quality edgework featuring the Shibs. Nor do they have "poor ice coverage." You can like their style of skating/choice of music/choreo, or not, but they are a quality team.