He does several things that are not goal scoring better.
But the game is ultimately won with goal scoring. It's the most important skill that a forward can have. And Domi lacks it.
Of course goal scoring is vital but the Habs mismanaged Alex from day 1 and a trade was needed.
We now have Max Domi who is more of a playmaker than goal scorer. You need goal scorers yes, but guys who can get tons of primary assists and play in all situations are important as well.