I don't believe that "home advantage" is such a big advantage.
Maybe a bit, no more no less.
That may feel reasonable, and is true in some leagues, but the statistics for MLS show otherwise, probably due to travel distances.
MLS teams on average win around half of their home games, but only 1/4 of their away games. That's a pretty big difference.
MLS is a tough, physical league, that emphasizes speed, and features plastic fields, grueling travel, extreme weather, and incompetent refs. - NK Toronto