Yes, if we look at it from this perspective, maybe you are right. Because the players are playing matches again without getting enough rest and they are catching up with form. Especially Real Madrid needs to play with each other a lot. Because the team is trying to adapt to each other with the new coach. The best way to do this is to play matches frequently. Real Madrid is doing very well right now, but I don't know if they can continue it.
We're yet to see the very best performance from these elite teams. The UEFA bodies should make some impacting changes because coming with this current ones, I don't think it will make any difference especially for the elite teams that qualify for all tournaments. They're anticipating in every tournament, divided focus and the least the UEFA body can do is simply instruct a new standard, inother to make things go easy for these clubs. Real Madrid players get exhausted because they play more games and not given enough resting time. These players are not bots but human beings that trained to stay fit.