Why is the format specifically mentioned? Because Young Sheldon has always been a "pretty" show. It uses a softer color palette than its parent series, relying on pastels and warm lighting to evoke nostalgia.
It forces the viewer to reconcile the "sitcom" version of the Coopers with the "real" people they became. The BluRay clarity removes the softness of broadcast compression, making the raw emotion on Lance Barber’s face (in his final scenes) and the tearful breakdown of the family uncomfortably crisp. young sheldon s07e14 1080p bluray
Even though 1080p is “standard” HD, streaming services compress video heavily. A Blu-ray disc offers of a 1080p stream from Max, Netflix, or Amazon. That means: Why is the format specifically mentioned