[five18pm]

Let me add couple more:

(1) Asking for a feature and then never showing up once when it is being built. "Hey, we are adding this page here. Is it okay?" <No answer>. "Hey, is this workflow good?" <No answer>. Once implemented, come around and ask "Why is this built this way?"

(2) Not being interested in any feature that engineering is interested in.

It is okay to talk to customers all the time, but once in a while turn around and talk to engineering too.

[bdehaaff]

I totally agree. I think the best PMs actually leave at least 20% of their roadmap for engineers to tell them what else needs to be built.