Seemed you were taking any chance you could to say he didn't need one. seemed? I take that back. You were.
He wants opinions on different brakes, not opinions on why or why not he may or may not "need" one. It's very stupid to get into the discussion of why someone "needs" any accessory for an AR. That argument always sours fast.
He doesn't need a brake. He WANTS a brake. Give him info on brakes, not info on NOT getting a brake.
You aren't giving out any helpful information. Were you insistent on a different brake because you personally know it to be better than most, I'd say yeah, tell him over and over again to get the point across.
I don't like brakes but that's what he wants so his barrel doesn't look ridiculous.