The professor is obviously not advising naive absolutism. He’s saying care deeply about your craft, and good judgement will follow from that.

Actually caring is what gives someone the itch to go back and improve things, versus happily calling it a day once minimum acceptable value has been delivered. The rampant enshittification of basically everything should make it clear which disposition is in short supply.

> Have the courage to go slowly, especially when everyone else is telling you that you need to go fast and cut corners.

The advice is aimed at students who haven’t yet decided which type they want to be. In fact it’s directly telling them to think for themselves and not blindly listen to you or anyone else here making the same case.