Hellebuyck plays deep in the net and that leaves him vulnerable up high and to tips/deflections. The Blues are taking full advantage of this with lots of traffic in front and bombs from the point. Helly and his teammates need to find a way to mitigate that better. The Blues are owning the net-front currently.
And that’s not to say playing deep in your net is necessarily automatically bad. Many goalies do that, particularly bigger ones, including the Blues backup Hofer. You just have to know the potential risks and mitigate that risk as much as possible.
Binnington is the opposite - plays super aggressive at the top of the circle. It cuts down the angles head on but leaves him vulnerable to east-west plays and backdoor tap-ins. So far, the Blues are mitigating their goalie’s vulnerability better than the Jets are.