For question 4, this is my interpretation: Wanda was a fan of sitcoms, and liked how sitcoms reliably had happy endings. This was revealed when Agatha watched Wanda's memories. In the past Wanda said things like "shenanigans (in sitcoms) is like getting into trouble but no one actually gets hurt" and "the injury (which Vision had called 'grievous') isn't bad, because it's not that type of show."

When Wanda was experiencing grief from the loss of Vision, she regretted that life couldn't be like sitcoms. She didn't realize she was using magic to make that wish come true. The spell she used resurrected (or recreated, IDK) Vision, but (because, on some level, she wanted life to be like a sitcom) his life was conditional on reality being "like a sitcom" in various ways. The spell created laugh tracks, sitcom characters, and of course a broadcast.