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A change may bring in some uncertainty as to the competitiveness between clubs but at the end of the day, football is about entertainment and uncertainty is what makes it exciting. So, no matter how the format changes, the Champions League will still be a tournament that many people look forward to.
I think UCL will always be interesting to watch because only the best teams in Europe will play in UCL. And I think this new format has a good thing where the team that will qualify is the team with the highest points collection. When UCL still uses the group format sometimes the team that qualified has less points than the team that did not qualify because they are in different groups. And now all teams have to play seriously and collect as many points as possible to get a slot to the next round. Honestly I am interested to be a part of history that will witness the new era of UCL.