Pelle tends to pout a little too long when he loses the ball. It's annoying, but Mane does this as well. I think it was last game Mane made a good run and then a bad cross, and after making that bad cross he immediately turned away and started moping. Turns out the ball ended up coming right back to him and if he'd stayed alert he might have scored.
The other thing Pelle does is he sometimes gets sulky at the end of a game. And when that happens, I would start subbing him until he learns. Especially when you can hammer the lesson him by bringing in Long who seems to never give up and will run all day. But 10 minutes less of Pelle at the end of a game in which he's been starved of service and has become too frustrated is not going to fix the our attacking woes.
I wouldn't argue that Pelle tries flicks/backheels/fancy one-timers too often. But to me, it's really a minor flaw. We dominated possession against West Brom without scoring, so it's not like a couple more safe passes back to some midfielder would have accomplished all that much. Did we give away possession cheaply? Sort of. But not in anyway that Pelle could solve.
We made a lot of sloppy passes against West Brom. In the end Pelle likely had the highest ratio. But in the end, someone has to attack... why not him? All we did last game was pass and pass and pass until finally someone made a bad one, or we put in an ineffective cross. If we had an attacking mid capable of making that incisive through ball, I'd say yeah, Pelle should just hold up the ball and pass it to that guy all the time. But we don't.
I actually get more annoyed when sometimes Pelle wins the aerial battle or chests it nicely, holds off a defender and then lays it off for JWP to blaze 5 yards over the bar, or it ends up eventually getting passed all the way back to the defense.