I can't quite believe I'm doing this, but here goes anyway:
There's some validity in the point Dreamy is trying to express. While we do create plenty of chances and score lots of goals, Mane is probably the only player we have who can the type of goals he is referring to.
Our game is about a shared, collective game, which is great, but when that is stifled, or we are outplayed - rare as that is - we don't - Mane apart - have a player that can just win us a game on his own, without help.
The likes of Lallana and Firmino can't do it, they have no pace. Origi isn't reliable.
He's talking about a player like Owen (Arsenal cup final), Suarez, Gerrard (countless times) or Torres. One simple pass over the top, or burst through the lines and a nerveless finish, and a victory can be snatched from nowhere, undeserved.
All great teams have one or two of that sort of player.
That's what he thinks we lack, and he's got a point.