I mean there's no doubt regression to the mean and stuff is a thing, but there's a reason that the elite scorers are consistently (and in some cases like Stamkos always) significantly about the league average in shooting percentage.
Well sure. League average is around 9%, most of the elite shooters in the league land around 11-12% over their careers.
But like everybody else, they have hot streaks a cold streaks. Were it that they could control shooting percentage, they would simply 'choose' to shoot at their career peak percentage at all times. But they cant. Just ask Stamkos how he felt during the Finals last year.
Furthermore, the elite scorers in the league are pretty much all bunched at the top of leaderboards in number of shots and shots per game. Their ability/speed/vision to create chances and put the puck on net at a consistently high rate is a larger part of their success than their slightly elevated shooting percentage.
Dano may never be a truly elite scorer. But if he's good enough to consistency generate chances and shot output, then he should wind up closer to 9% than 3% eventually. Worry when the shots per game dry up.