Aye. I know we've had this conversation before, but I genuinely view the early 2010's Kings and Bruins as old school hockey's last gasp. Hell, the Blues team that won it all could be considered a throwback.
That late 2000's/early 2010's period was largely the last hurrah for enforcer type players for example. Fighting has remained part of the game, but generally become less of a factor as time has gone on. We can argue til we're blue in the face about the disciplinary bit regularly getting it wrong, dirty hits being in the game and so on, but there aren't as many cheap shot artists anymore. Guys like Cooke, they aren't as big a factor now as they were then. Crosby had to play through all that, Ovi too, the younger and prime aged stars of today haven't played through that sort of regular season hockey.
Crosby's arguably the most talented grinder ever, I think some of that stems from having entered the league when he did, but also how the minor leagues he played in were influenced by what kind of leagues the NHL and AHL were when he was a kid/teenager as well. Same can probably be said of the twins, they had to be tough, they played most of the 2000's as players with primarily offense geared skill sets.
If they'd began their careers when McDavid did their numbers would likely be bigger on a consistent basis. The game has changed and so has training, equipment, stats, analytics, how the game is reffed, and so on. I think they'd benefit from a less punishing league for sure. I think their hockey IQ's would still have them towards the top of the league, their hockey sense was off the charts.