If you force parties to fight cases that are moot, cases where both parties' interests aren't affected, then you're deciding cases based on arguments from peopl

If you force parties to fight cases that are moot, cases where both parties' interests aren't affected, then you're deciding cases based on arguments from people who don't care about winning. That's sort of antithetical to the adversarial system, where a basic premise is that the best way to make a decision is to hear parties on each side of the issue. If a similar case occurs, then 3rd parties (Apple, ACLU, etc) may be able to submit amicus briefs to help the defendant. Apple might also be able to intervene and become an actual party in the case, if it can convince the court that the case's outcome will harm its interests (see Rule 24 of Federal Rules of Civil Procedure).