Empathy, which is unfortunately but understandably pretty rare in tech. When the engineer lacks empathy for the end user, the human, we end up with terrible UX,

Empathy, which is unfortunately but understandably pretty rare in tech. When the engineer lacks empathy for the end user, the human, we end up with terrible UX, unsatisfied specs & reqs, bad software in general. Never blame the user, the customer - they are always right. If the user is repeatedly doing something "wrong", they're not wrong, the engineer/designer is wrong, and needs to readapt to the what the user sees as right.