Exactly! The lack of women was a problem, one that could have been adressed by the writers. Instead, they chose to give the action, save the universe, stuff to the men and have Uhura's growth confined to her relationship with a male character in a romantic relationship.
Boys save the universe. Girls are girlfriends.
Nothing would have prevented Uhura from giving comfort to Spock even if they were not in a relationship. It would have provided a starting point for one and kept us from the painful scene where Spock is forced to change a ship assignment by his girlfriend.
Having the relationship already established weakened both characters. The loss of Vulcan would have given us a reason why they were drawn together.
And *I* think that having them in a relationship strengthens both characters for later stories, plus it shows the audience that THIS version of Star Trek is NOT the same as the TOS. . .so there

~FS