https://screenrant.com/the-conners-season-7-david-absence-worse-after-johnny-galecki-update-explainer/

Johnny Galecki's semi-retirement from Hollywood is the reason for his The Conners absence, but his surprising latest project makes this odd.

Why The Conners Turned Johnny Galecki's David Into A Deadbeat Dad (https://www.looper.com/1843136/why-the-conners-johnny-galecki-david-deadbeat-dad/)

Johnny Galecki hasn't been on "The Conners" since Season 2, and didn't return for the series finale. Now we know why, and how it changed his character.