My main objection on Simmonds is how streaky he is. He's the prototypical powerforward dominating opponents physically and on the scoresheet at times, only to completely disappear and coast in other games. Playstyle resulting in minor injuries and fatigue might play a role. Lack of foot speed is another issue, as our team is super fast and feeding off counter rushes and (semi-)breakaways.
On the other hand, when on, he's an effective player who provides a wide array of weapons (net presence, scoring, hitting, fighting). When comparing him to current Lightning players keep in mind the Flyers are a way worse team. His stats would arguably be better on a line with our top-6 forwards or with the "top-7" line, hell even with Paquette.