Either all schools in the division should play out all the matches, or they all get the choice to stop at 4. A rule like this one decided by the conference is just not smart when other schools can save their players health stopping after the match is decided. Early in the season, I can see why teams would play them out to ensure getting all players complete matches. You're right, play out a meaningless late season match and get hurt, what good is that? Besides, once a match is decided, the advantage often goes to the players on the team that have lost the match, they have nothing to lose so they often just hit out with no repercussions for missing.