As a teacher and coach, there’s not a single study I’ve seen that says specializing is good. College coaches want safeties that played CF, point guards that played soccer or football, etc etc. every year I see very good high school athletes quitting their sports because they specialized too much, too soon. Remember youth and high school sports aren’t a career, but are about fun and teaching life lessons/skills. Once a kid gets to college, sports become a job.