Things have changed since City won. The pressure of winning points is spread out over more games now in UCL and that’s where we can afford to rotate
The lower teams in PL have spent a ridiculous amount of money (even compared to seasoned CL teams like Atleti or Barca or Inter). We are looking at a very different schedule and difficulty levels between league, Europe compared to even 2-3 years ago
You don’t see Liverpool or Arsenal - the two best teams in the league right now - rotating a lot in their league games, even against lowly opposition