"can describe ... pros/cons of their approach" I've always tried to do that... until recently. With a new recruit, this is the fastest way to nightmare discus

"can describe ... pros/cons of their approach" I've always tried to do that... until recently. With a new recruit, this is the fastest way to nightmare discussions. He always emphasizes the cons of my proposals, and never admit that his proposals also have cons. To be honest, I really think he believes what he says, he seems to not see ahead of time where the blocking points will be. I am now forced to only submit the pros, and prepare an argument for the cons, which is rarely needed. This is not a way to have good technical decisions.