Comparing maxes to other people I think is overrated. Just like comparing pitching velocity. Unless you have a way to normalize it to make it competitive for everyone. I know percentage of body weight is popular. At some point you are what you are and are only really competing against yourself. Your number only has meaning to yourself as a measure of determine if what you are doing is improving what you seek. And I'm probably not trying to advance my 1RM during the season. I've got games and travel to recover from. It's offseason stuff.1 RM in and of itself is meaningless...
I'm not sure how apples to apples basketball is to softball, but Geno Auriemma talked about practice to game ratio in the US compared to abroad in some What Drives Winning seminars. I'm not going to fact check the 6 practices to 1 game ratio he suggested is done abroad, but I do believe we are relying on players to self develop and things are heavily slanted towards games only. That's the money maker.
For us personally, we had league night, and tournament weekends. Depending on the tournament, we're playing games 4 days out of 7 if there are Friday evening pool games. Not much time left to practice unless you never take a day off.
So I dunno, maybe it's American culture of individualism that leads us to build great athletes, but that doesn't guarantee a great team. Seems the world is catching up to USA soccer on the women's side too.