That's extremely simplistic. Firstly, it's rare that goals happen without assists. By my count, Ovechkin has 35 unassisted goals in his career, and only 12 of those have come in the last 8 seasons since he's become much more of a shooter than play driver. Secondly, no goal happens in a vacuum, whether an official assist happens of not. Even if a player steals the puck from a defenseman and scores in the zone, he wouldn't have had that opportunity if the team wasn't in the zone in the first place, if the other players weren't in their positions, etc.
Players who routinely transition the puck, recover loose pucks, forecheck for possession, steal pucks, screen the goalie, etc, etc, are doing things that lead to more possession time for their team that give more opportunities for their team to score. Those who overvalued goals seem to focus solely on the end result rather than the process. Yes, in general, when a goal happens, the goalscorer is typically more important that the primary passer who is typically more important than the secondary passer. But an elite playmaker is creating a multitude of chances that don't get finished in order to get that goal. Each play might not be as important as the goalscorer but by creating more of them, the end result is the same. The puck still ends up in the back of the net.
For someone like Ovechkin in the back-half of his career, he's frequently playing off the puck and waiting for the shot. This means he's a lot more reliant on his teammates to not only get him the puck, but to do all those little things required to gain and maintain possession. He was tracked this year as being on an island by himself in terms of a lack of plays that result in a change in possession. That's fine because his ability to score is so valuable, but it also means his goal totals need to be put in context and some people don't seem to be able to do this.
When we look at players with the sample size of Ovechkin and Crosby, we can see their effect on goal totals over their careers, and this includes the ability to shoot and pass and general production, but also all those little things that create possession and goals. Despite the Caps and Pens being similar quality teams since 07-08 when these stats were first introduced, we can see that Crosby has a greater effect on increasing the goals for of the Pens (+0.69 GF/60) than Ovechkin does for the Caps (+0.39 GF/60).