You are wrong. I played high level in 2 sports and have coached. We get better playing against higher levels.
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Only to a certain point, which SBMM already accommodates. Sure, you have the JV skirmish against the varsity. But you don't have the high school team skirmish against a college team, or a pro team. No learning would take place. There's a reason every sport everywhere has different levels of competition. I played NCAA Division I sports, btw, if that's suddenly a prereq.