Originally Posted by NCC-73515
Since Starfleet is an earth organization, it is logical that there are mostly humans in it
As far as I know, all the Fed members have their own fleets.
I am not sure that your viewpoint is backed in the canon of Star Trek. The only time we see distinct planetary starfleets is during the pre-Federation era. The Earth Starfleet of Captain Archer's time is not the same as the later Federation Starfleet.
The United Federation of Planets main exploration/military arm is Starfleet. We have see Vulcans, Andorians, Bolians, and other species all in Starfleet.
I always chalked up the high level of humans in Starfleet to the fact that TV shows have smaller budgets for makeup. My hope is that a high budget movie like this one will have the extra funds to show how diverse the Federation really is.