Well actually.. a lot about coaching is putting players in positions to succeed, and putting players with other players who maximize their strengths or reduce weaknesses.
So when you put Danault - Armia out there to start 3 on 3, that's bad coaching.. and insisting on using two of your better wingers with a terrible center is still bad decision making.. and putting a pairing together that exasperates each others weaknesses and refusing to break them apart is still bad coaching.
So no, it isn't about putting line together.. what the lines do is give an insight into what the coaching staff is thinking and when the pairings, lines don't make sense, and the player usage doesn't make sense.. it's a fundamental coaching failure.