Regarding the best performance is an obligation demanded by every team that wants to win the title, without thinking twice I agree about it.
Imagine a team as big as Real Madrid, Barcelona, Manchester City, Arsenal, Bayern Munich, Bayer Leverkusen, PSG is not ready to face the new format, of course that is impossible.
Yes. The new format of the champion league can indeed be said to be detrimental to small teams, especially teams that have just entered the UCL league, they will have difficulty dividing their concentration between the UCL league and the domestic league. With squad material that is not evenly distributed, of course this makes them a little disadvantaged if their players continue to be played, especially if there are players who are injured, of course their steps in the champion league will also be hampered. What is interesting is that the new format of the champion league will only be implemented next season, of course all teams will adapt, we'll just have to see how this new format works, whether it benefits all teams or vice versa. But what is clear is that all teams' schedules will increase next season with this new format.