Luke Walton has signed up for a job he will hate having soon enough, because that is the natural order of things.
The pull of home, the pull of the Los Angeles Lakers, the pull of running his own shop away from the cruel tyrannies of Steve Kerr, the pull of capacious pots of money . . . it all added up for the first (or it is second) acorn from the Kerr Coaching Tree.
Those are all personal reasons to say yes. There were equally compelling reasons to bide his time, starting with the fact that the Lakers are an utterly dysfunctional mess from roof to floor, and are not likely to repair themselves any time soon.