Real life rotation is sometimes forced due to injuries and other circumstances like youth development, in FM it seems forced at all times for a busy squad, that applies to the AI as well. As time progressed in my game (I am in 2049) no one virtually plays above 30 PL games a season, checked all teams and it was even lower for those players who are regularly on internationals. There is a lot more "forced" rotation in FM than in real life which of course predominantly affects CL teams. The other problem is playtime, there are ways to manage this but my squad is often rotated based on playtime needs and not so much tactical needs, once again, the AI is also affected by this. Simulating seems to bypass some of the playtime issues, how? ... I don´t know. Not a big deal in the long run, I have just adjusted and learned how to cope with it. It is annoying at times though, it affects the AI negatively a lot more than it does my team, they are not good at replacing jaded and injured players. All this isn´t a problem for teams who usually only play once a week.

are u Greek by any chance?