The rationale for that is, they want to encourage as much goal scoring as possible, which is why they relegate head-to-head to the third tiebreaker.
Interesting that the Premier League has Goal Differential as their first tiebreaker, but the Spanish La Liga does use Head-to-Head as their first tiebreaker.
People can rationalize anything. Take Democrats, for example. And apparently Word Cup soccer organizers.
Besides, I thought soccer was “The Beautiful Game,” where the intricate placement of players and deft ball handling to slowly gain sufficient advantage to score a goal wove a rich tapestry of athletic purity. Unlike the crass American sports like “Gridiron,” where the garishly ostentatious and unsustainable demonstrations of point scoring inequality rendered us “Ugly Americans.” What’s the big deal about goal scoring all of a sudden?