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What has happened in Serie A this season to the Atalanta team should not be taken entirely as a judgment because Atalanta could have given their best game in the Champions League this season although I also do not imagine Atalanta could beat opponents like Arsenal easily. Because in the Champions League all teams will definitely put all their best abilities into play in order to win, especially this season each team will go through a different way in the Champions League which will require each team to develop a more precise strategy.
Atalanta performance was also not very impressive in Serie A last season, but in the Europa League they were able to show their best side by beating the two strongest candidates to be champions (Liverpool and Leverkusen) before finally confirming themselves as champions. Atalanta may be able to spring a surprise in the UCL, but Arsenal will not be easy to beat in their current form.
All teams always try to win in every match, but differences in quality and other unexpected things can change the outcome of the match. The new format is a bit tiring because the number of matches will increase, the coach must be able to keep his players to always maintain their best performance so they can qualify for the next round.