Liverpool can play better and win with a bigger result but 2 - 0 is enough for them. It is not a massive win for Liverpool but three points are more important to aim at a first position in the group.
Yes, however, the main thing is to get the full 3 points. Because, even if you play very beautifully and well, if you can't win it's useless. It's just a matter of how the coaches evaluate the course of the match and also their performance both as a team and individually. At least, Liverpool secured this match with a win.
Honestly , Leverkusen is playing so smooth that I wouldn't be surprise to see them in the finals or even winning it because right now they seem to be one of the first candidates alongside Liverpool to win the trophy this year.
Currently, Leverkusen can be said to be in good form. Even in the Bundesliga, they can play very optimally. Likewise with his performance in the UEFA European League, his consistency in every match can be felt enough. It's just a matter of how they will compete against other big clubs when they have passed the group qualifications. Especially after the arrival of ex-UCL clubs that failed to qualify for the group.