The problem is that at 25 unless someone is actually experienced in an fps game previously, the rank system placement can stick them in the 40's hell (or the new equivalent). They aren't really going to learn anything there other than contempt for their teammates. We got people in the thread that have to deal with that rank and the people there and can attest to what it's like.
What? Ths logic makes no sense. If a player has no experience in FPS gamed and OW is their first shooter, odds are they will be matched below 50 no matter what level they are. Why should anyone be worrying about that? That is their skill level. Raising the level requirement doesn't raise the skill floor of competitive at all. It just forces players who want to play with their friends to grind more Quick Play. Zzzzzz.