A designer who can’t explain their rationale is useless—open to the whims and desires of everyone around them. If they don’t understand their own decisions, they can’t advocate for your users or replicate their choices across projects. They can’t argue. Every designer in the world needs to be able to answer: «Why did you do that?» If their reply is, «I can change it,» you’re absolutely fucked.

«I think it looks good» is not a rationale. It’s a red flag.

Mike Monteiro.