Robby was clearly good enough to make the team out of camp last season. He was a victim to the numbers game. That was all coming off of a season ending injury.
Robertson puts himself into terrible situations. Even on his most recent injury, as blatant of a penalty as it was, Nick was no where near anticipating any contact during that exchange. It's a huge problem. Call it soft, but Nick needs to limit that type of action in and around the boards. And when he inevitably has to engage, be the aggressor, not the victim.
You see it all the time with Matthews. He is so strategic on when he decides to go into contact and when to lay up. This is all about preservation. So many times you will see Matthews allow the defender to take the puck instead of engaging in a physical battle. He knows he can just strip it right back off their tape.
For Nick it has always been less is more in all aspects of his game. Sure it's nice to see him engaged physically, but he won't survive playing that way. He chases the game far too much instead of letting the game come to him. The skillset is 100% NHL quality, it is all about adapting at this point.
I've always admired Nick's work ethic and willingness to compete, but he actually might be overdoing it in both of those qualities. Keep it simple, and he is an NHL regular.