These situations are always delicate, as going to arbitration can fracture a relationship between a team and player, and on top of that, the process almost always favours the players, which could be a mistake for Toronto's salary cap.
That's why the team have been encouraged to not let things get that far and to try and meet Robertson somewhere in the middle of his asking price and a fair value, but after scratching Robertson for the majority of their Stanley Cup Playoffs run, it's unclear exactly what Toronto see in his future.
Ultimately, the team have been down this road before, and after the hearing favoured Samsonov, the goaltender struggled mightily in his next season, so to avoid that, Toronto may be pushing to get a deal done outside of a hearing, but for now, all signs are pointing towards the team having to pay Robertson more than they'd like moving forward.