Guardiola is a master in rotating players and his strategies and tactics makes it even easier to do so. My eyes are on Chelsea next season, they are one of the teams to look out for. With Pochettino taking as manager, I would want to see how well he can utilize the players at his disposal and what tactics and formations he will be working with to get the results. I really hope they will not repeat the poor form of the just concluded season.
For Pep Guardiola I totally agree with your opinion, he is indeed an expert in tactical terms and rotates players to anticipate various possibilities, namely player injuries and card accumulation. Like Arsenal's setback at the end of last season, they failed to win the EPL title, and one of the factors in my opinion is that Arteta rarely rotates his players. As a result, the core players and back-up players are not solid so they don't perform as expected. Pep is very good at this I think, almost every player gets a place to play, adjusting to the team they will face.
For Chelsea we all know, since the departure of Abramovich This team is no longer so arrogant in buying players and changing coaches, Pochettino is their first coach in the hands of a new owner, before Tuchel was in the transition period between Abramovich to Todd Boehly and friends. Hopefully next season they can end the season well, at least being in the top four of the standings so they can play in the Champions League again is better than finishing in 12th place.