Agree, but even in the pros, it doesn't make the situation very stable particularly since the argument for equal play time is harder to justify as you move up in age and difficulty level. The exception is when the 2nd is clearly the weaker keeper and is just happy to play for the team, knowing they won't get many minutes.
The reason GKs accept being on a team with two, or even three, GKs as they get older is to get exposure. The number of high level teams drop at the older age groups as talent consolidates. For GKs, that can leave some quality players without access to college scouts. So, many of them will join a high level team (particularly DA for boys) understanding that they will get less game time, but knowing they can get more attention. I know many DA teams that will choose which GKs start their junior year depending upon which ones are still trying to get college offers and which scouts will be in attendance. Once a GK has his offer, he'll play less understanding they need to showcase one of the other GKs. Some will even move to an SCDSL Discovery or CSL Premier team at that point, with the blessing of their future college coach, in order to get more playing time and reps.