Warning! Spoilers ahead for Young Sheldon season 6, episode 16. Young Sheldon season 6 finally gives Missy a compelling narrative, but not only does it change her The Big Bang Theory story, but it also makes it so much more devastating. TV's number one comedy has been juggling a few multi-episode narratives this year, which gives several Cooper members the attention they deserve. Georgie has been busy navigating being a new father amid his complicated romance with Mandy. Meanwhile, Sheldon just dealt with a big failure with his grant database project. Finally, Mary and George's marriage is on the verge of fully breaking down. Amid all this, Missy has been relegated to a supporting character with no real arc.
https://screenrant.com/young-sheldon-missy-big-bang-theory-story-changes-sad/