In some cases it might help. Because then it becomes “natural” - on-call thing. It’s not something someone dreads as in “god, that week is coming”. Also, it spreads the fuck-ups and peaceful times better.

Increasing hand-offs by 7x is sub-optimal and interferes with folks wanting to take continuous vacation time. Again, I can see for ops teams that could be true, but very much disagree that on-call should be a "natural" thing for dev teams in the first place. It can be a necessary evil that should be minimized (the personality of people who like firefighting and quiet development are quite distinct and there are people who actually like the former.) On the latter point, I think that benefit is very much a mirage. If there's a flaw in the system causing a "bad week," it actually might be easier for the first person who gets the hang of it to deal with it than to try handing off and teaching the next one in the rotation.