Here's the problem with that model.
A team can beat another team in the standings even if that team has a losing record against the team it is tied with. Example. The Spurs and Golden State wind up tied at the end of the season. The Spurs had a better head-to-head record vs. GS, but Golden wins the tiebreaker via aggregate scoring. I would be highly pissed in that scenario. It also punishes teams more severely for events out of a team's control, like injuries. Another example. Popovich and Co. typically build the Spurs so that they can handle injuries reasonably well over a regular season campaign. Let's say Kawhi goes down for 10 games. Over that span, the Spurs go 7-3, winning a lot of close games. At the end of the season, they find themselves in a 3 way tie for the 2nd seed. They hold all the traditional tie-breakers (H2H, conference record, division record) over the two teams in front of them, but their aggregate scoring is worse. In the EPL, they would drop to the 4th seed (if the EPL had playoffs). Again, I would be highly pissed.
That said, I agree that aggregate scoring is good for a low scoring game like soccer since cheap tactics like parking the bus are so effective, robbing the game of action.
As for 1-1 game series. Well, we're no longer in the 30's. Modern travel makes back and forth traveling across Europe not too difficult a scenario (The Lakers and Celtics had no problem travelling across the US for a 7 game series in the 12 times they've met in the Finals). I understand the logic. Giving each team a game on their home field. But instead of aggregate scoring determining the winner, I think a better idea is that it determines who gets home field for game 3.
And it's easily proven soccer's comeback factor is relatively low. The most common score is 1-0

. When it's mathematically harder to score, it's mathematically harder to comeback from a deficit. Also, it's impossible to take the lead from a deficit in soccer on a single goal, making comebacks more improbable.
http://www.decisionsciencenews.com/2...e-goal-of-1-0/