The away goals rule is often counter productive. Jonathan Wilson explains the logic of getting rid of it here https://www.theguardian.com/football/blog/2013/mar/13/the-question-football-away-goals
The article is 8 years old now but the logic still stands. I'd be happy to see the back of the away goals rule, all it does is make the home team wary of conceding. I would be willing to wager that average goals per game in euro competition will go up if the away goals rule is scrapped. If so, surely that's a good thing.