Sounds like the obsession with perpetually-scheduled competitive sports could be just as easily identified as a problem. Intramurals are an option, and immigrant parents who place a larger premium on academic performance like to opt for that instead. That aside, a rec league is, what, 2 nights a week? No reason to believe that paired with homework would lead to burnout.
Math and reading takes practice. That's what homework is. The top performing countries don't do any differently. It's interesting that there are people who worry about the quality of public education being under attack by Republicans, but embrace these non-evidence-based ideas for education reform that ultimately will only benefit the upper class.