In the case of Sing, why did that game prompt such a response then? His lane went great (thanks to Aui but still), he hit numerous amazing arrows, and he didn't die needlessly at all throughout the game. He was just drafted a poor hero vs the Navi deathball (or rather the team was drafted poor heroes vs it). His single target stun and merely above average scaling wasn't his fault. You could argue that he should be able to play more heroes, but I'd retort that he can, but Pieliedie is refusing to be creative, which is why he picks the same heroes for every player on the team, not just Sing.