I think the posters pointing out how coaching dominates the sport today are correct.
Here's how recent expansion teams have done mid-way through each of their inaugural seasons (Vegas not quite being at the mid-way point yet, but nevertheless). I attempt to eliminate "loser points" from the 2000s' era to today, for comparison purposes:
2018 Vegas 24-11 (.686%)
2001 Minnesota 13-18-10 (.439%)
2001 Columbus 13-22-6 (.390%)
2000 Atlanta 10-24-4 (.293%)
1999 Nashville 14-23-4 (390%)
1994 Florida 17-17-8 (.500%)
1994 Anaheim 16-24-2 (.405%)
1993 Ottawa 3-36-3 (.107%)
1993 Tampa Bay 15-25-2 (.381%)
Not only this, but Vegas currently sits in 1st place in the Pacific. Completely unprecedented.
The only time, ever (not counting semi-expansion Edmonton in 1979-80 or when expansion teams were guaranteed a trip to the Finals in 1968), that 1st-year expansion teams were fairly competitive was 1993-94, when Florida was 4th in its division and only 1 game under .500, while Anaheim was also 4th in its division. Both teams were the best non-playoff teams in their respective Conferences.
Still, being respectable isn't the same as leading the pack after 35 games.
Clearly, the NHL has changed to the point where top-level players are not necessarily needed anymore to ice competitive teams.
Coaching rules.