Devil's Advocate - or - The Voice of Reason?
They may intend to be helpful by pointing out problems or challenges in an idea, but ultimately this focuses attention on what doesn't work rather than exploring unexpected ways that might work.
Those who act as a voice of reason will offer useful information to build on the ideas given.
Even if they have concerns about an idea, they are willing to work with it and make it better.
Devil's advocates, on the other hand, seem hard pressed not to find fault and stop action from being taken, without providing better alternatives.
So next time you find yourself about to say "Let me play Devils Advocate here ... "
"As a Voice of Reason, have we considered that if we do this, outcome 'A' may occur, whereas, if we were to take this alternative approach maybe we could get a better outcome"