I think the skill of the Astralis players is deceptive because of how disciplined they are at sticking to roles.
Take Magisk for example. At one stage in North, lots of pro players and analysts were calling him the #1 player in the world. He was particularly great on CT sides, where he had the freedom to go all over the map and almost treat it like a deathmatch. On Astralis he has less freedom and just does his job, for example holding pit on Inferno.
This is why other teams can't just copy Astralis and achieve the same level of success. You can copy their positions, utility usage, bombsite executes, etc. but if the players implementing these tactics aren't as skilled then they won't be able to do the job as well.