First of all, what's that stuff about 1 character per player? How's that? No one has 1 character per player. It's 5 like it always was.
Second, we do add some sci-fi ships, but that's because most custom ships that are being made for Freelancer are not as good as those. If a sci-fi ship is done well and suits what ships we already have (Battlestar Galactica, for example), I don't feel bad about adding it. Most new battleships are from Star Wars, and guess what? anyone complaining about them? no, cause there's nothing too familiar like Star Destroyer or X-Wings (I'm not intended to add those).
Babylon 5 ships mostly have not-very-high-quality models so I doubt we'll ever see them in Discovery (sorry Angel). As for Star Trek, there are some very cool-looking ships, problem is that most of them have 'bird' or 'disk' configuration that won't fit well into Freelancer's trade lanes and gates.