People have mentioned that other teams with exceptionally high PDOs played similar styles, so I'm inclined to believe that ("all teams" playing similarly is not what I've observed, though-- many have much more of a "don't overthink it and get everything on net you can" mentality, and honestly that could be a better approach overall, despite a lower PDO).
Genrally teams with consistently high PDOs do it with goaltending and defence. Not shooting percentage. If you can find me a team that is consistently top five in 5v5 shooting % I'd also like to see it.
Teams do play a little differently, but the majority of the difference comes down to whether teams are good or bad. In the defensive end teams generally play man on man, zone, or box+1. There are a few types of forechecks and neutral zone systems, but many teams use a variety of these systems depending on the situation.
Again, if you can find teams that have consistently shot the lights out for a 3 year stretch, let me know.
Also shooting % generally stays consistent for players when they change teams, but team shooting % bounces around a lot. I guess this is due to talent level and shot selection choices for individual players.
I don't know if it will continue (the evidence seems to overwhelmingly point towards "no", but I'd like to know why). Style also isn't only dictated by how a coach historically does things, it's also driven by personnel, and the coach adapts to that. Most coaches don't have one set style, from what I've observed, and I've seen them completely 180 their approach during their tenure due to what they have to work with.
Almost all teams have more in common with systems play than they do differences. You don't see teams play a 1-4 shell all game, and you don't see teams doing a 4 man forecheck. I think the general ideas of what works the best in hockey are pretty well established, and if someone does start doing something different that works (like the drop pass entry on the PP) it is picked up and utilized almost immediately by other teams becase they are constantly analyzing video.
Just look at shots per game data. The Oilers are shooting the most in the NHL rn. They take 34 shots per game. The Ducks are 26th at 29. The difference between the no 1 team and the 26th team is only 5 shots per game. That's peanuts and mostly has to do with strength of roster. The difference between systems leads to a difference of about 2 shots per game or less for most teams. It is nearly nothing.
I have the same uncertainties about shot percentage, to be honest. Sure, history shows that shot percentage always regresses to the mean, but again, I'm curious why, and why a player couldn't in theory be so averse to shooting from everywhere that they end up with high shooting percentages (even if the worst-case result is that they never get many shots and end up poor players overall).
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Here are the shooting percentage leaders since 1990 with over 500 games played.
Gary Roberts 1 with 18.7%
Alex Tanguay 2 with 18.6%
Draisaitl 3 with 18.1 %
Top six forwards generally fall between 10-16%.
I'm not uncertain that the shooting percentages for the Canucks players shooting the lights out will fall. I'm certain. The only question is when.
Your average 20 goal scorer only gets maybe 2-3 tap ins per year. Goals are hard to score in the NHL. If you had a theoretical player that was so averse to shooting that they had a 30% shooting percentage they would score like 4 goals per year and pass up many potential goals. That would be like employing a player that only turns left, or a player that only takes slapshots. Any player that doesn't have enough hockey sense to shoot the puck on quality chances just isn't going to be good enough to make the NHL.
