The failure modes of a design manager sit at two extremes: absent until review day, or so present that no designer makes a call without you. Both produce the same outcome — a team that cannot think without permission.
// Be early, not final
The most useful moment to be in the work is the messy one — problem framing, constraints, what we are not solving. Turn up then and you rarely need to overrule anything later. Arriving at the polished mock is where interference starts.
// Ask, don't redline
“What happens if the network drops here?” moves a designer forward. Redlining their spacing moves the file forward and the designer nowhere. Reserve direct edits for genuine quality risk, and say plainly when you are doing it and why.
// Make your standards public
A team can only self-serve against criteria it can see. Written quality bars, worked examples, and reviews where you explain the reasoning behind the call — that is how taste transfers. Otherwise every judgment lives in your head and every judgment needs you.
// Let decisions stand
If a designer makes a defensible call you would have made differently, let it ship. The cost of the small delta is far lower than the cost of teaching them that ownership is conditional.