https://screenrant.com/the-big-bang-theory-stuart-proper-spinoff-after-young-sheldon-explainer/

Six years after it ended, The Big Bang Theory is finally getting a proper spinoff after Young Sheldon failed to stay true to its premise over time.

Well, why "failure" if Young Sheldon had been a Top-10 show in viewership throughout its entire seven-season run (aside from the fact that it's a prequel to The Big Bang Theory)?