Why do goals only count though? Particularly because Marner is known as a playmaker while Matthews is more of a goal scorer...
Two assists per goal and you can score a goal unassisted, but there are no ungoaled assists, those would just be "good plays" that never amounted to anything. There are always a whole bunch of highlight reel playmakers that do all the work and the shooter reaps the easy score but with the majority of goals it is always going to be the shooter that beats the goalie so a primary assist is still less valuable than a goal. Only the 4 goals put in the net count towards a win, not the 8 assists.
I can't see how you could measure exactly how much more valuable a goal is because except for breakaways there is a lot of moving parts in any possession leading up to a score and more than one smart play is usually required every night to make a 180pt tandem. I would say 45-55 is definitely more valuable than 25-75 as a 55 assist play maker is still top 20 in the league but a 25g scorer isn't in the top 70. As a defender you want to make Mitch shoot, you don't want it to be JT right? Once Marner gets a bit more comfortable he won't throw it back to Tavares on all the iffy chances and his goals and Tavares assists will increase.
And all things being equal a winger is always less valuable than a center and the best UFAs available are always the wingers. Kucherov's last deal didn't happen in a vacuum, one of the reasons he took $9.5 was because he was a winger, and he is a much better shooter than Mitch. I am not anti-Marner, I am just anti RFAs demanding UFA money and pushing that ppg matters more than the position and the goals you actually score. I want Mitch to become the Adam Oates of wingers but elevating Tavares from 84 to 88 pts doesn't prove he is there, just that they bought him an $11M center that meshes perfectly with him. A year from now I could well be eating these words but being paid more than the scoring champion should be enough shouldn't it? If he thinks he's Gretzky 2.0 then lets do the short bridge and see it happen.