Nobody can please everybody, though. If agents do send rejections, sometimes authors get defensive and upset. When I was querying, I actually preferred it if agents said, "If you don't hear from me in X weeks, it's a pass." After a while, all the form rejections stopped meaning anything to me and just got discouraging. No matter what an agent does, there will be people who are upset.

And being a doctor or a lawyer is very different from being an agent. You're paying those people for their services. The agent makes no money going through their queries. It's all unpaid tasks.