Draisaitl obviously matters to the Oilers, you cant produce that much without mattering. The question is does he matter more than any other player on any other team to their team? Thats what the Hart is (supposed to be) about. Again, he probably gets it because lots of points with most goals seems to be the actual criteria, but the Canucks without Hughes go from wildcard to lottery, while Oilers are still a playoff team with a healthy McDavid, hes that good. If you replace Hellebuyck with an average NHL goalie they lose a lot more than the Oilers do without Draisaitl.
I just disagree that Draisaitl matters more than any other player in the entire league to their team. He clearly is a top 5 ish important player to his team, McDavid should be right up there too, even with those underlying stats. They both are the only reason the Oilers are good, they absolutely rely on both of them. But some teams rely on ONE guy instead of two somewhat equivalent players. Those singular players are more compelling for the Hart.
Again right now Draisaitl would be my expected winner, but only because thats just how its voted on. Guy with most points, unless someone with a similar amount has a lot more goals. Bonus points if you havent won one yet or werent an asshole at the all star game.