Let's review some ships that we can fly right now. I wont list them all as this would prove futile, but just a few good examples.
Hornet Ghost: Its stealth module is still non functional (can replace it with a ball turret with no loss of function). Stealth is still not properly implemented. Radars are omni directional, all-powerful and see everything, all the time (no masking by terrain, or asteroids for example). This is a 2012 backer ship.
Those racing ships (350r, razor, etc.): still no races in the PU, were promised years ago. Entirely useless.
Carrack,
Constellation Aquila, and other
exploration ships: no exploration gameplay, and nothing to explore anyways (only one star system, which is fully mapped and well known).
Caterpillar: if we set aside the fact that it still doesnt open properly due to graphics and physics engine troubles (its been years.. they are still on it..), it has data running abilities (nowhere in sight), and a tractor beam for piracy (nowhere in sight either, and the tractor beam equipment is 3D decoration). It's got a galley which is non functional, despite the game having food now. Also toilets, non functional. If you use it for pure cargo runs you find out the economy is still non-existent as prices are totally fixed, and it's just stocks respawning at various rates.
Freelancer: despite being a very good all-rounder (packs a real punch, flies not so badly, has cargo, range..) all 3 co-pilot seats are for decoration purposes. Yeah you can turn the consoles on but you see the same power control panel as the pilot and it's even non functional (trying to change settings does nothing).
Hornet Tracker,
Vanguard Sentinel, etc. (utility ships): zero gameplay function. Their supposed improved radar is the same all-powerful radar that equips all other ships even the smaller ones. Besides some of these have an engineer station (e.g. the Vanguard), which does nothing.
Reclaimer: It's big. It's a huge 3D asset that does absolutely nothing. No associated gameplay anywhere in sight.
890j: good for target practice. Useless otherwise as passenger missions are not a thing.
Cutlass Red: supposed to be a flying medi bay. It's currently entirely useless. There is no planned gameplay that would justify extraction via this means vs just respawning.
Cutlass Blue: supposed bounty hunter with police colors. Tractor beam non functional, associated gameplay not there.
Cutlass Black: supposed pirate ship (probably associated with a Caterpillar for looting). No ship to ship boarding anywhere in sight.
Eclipse: no stealth (see omnipotent radars above)
Mantis: supposed to be an interdiction bubble generator. CiG didnt think this through as there is no way to predict where people will jump from or to, or to follow them against their will. As opposed to ED way of doing it, the Mantis would have to sit in "normal space" and activate the bubble to stop ships that would pass by. Not sure anyone in their right mind has invested any money in that.
Starfarer: no in space refuelling (and really no proper way to stock fuel independently). No ship to ship docking. Again a huge useless 3D asset.
Valkyrie: troop and vehicular transport. Transporting troops has still zero gameplay value, besides the 50 player limit, FPS missions can be soloed or done with 2 or 3 people easily, and there are only 2 of those. Otherwise absolutely no use. (edit) also you can easily put that many people into a Freelancer cargo hold. Jumpseats have zero function aside from looking cool on screenshots.
Herald: data runner. There is zero gameplay associated with that. Funny looking little ship, but useless.
So yeah it's not ALL ships. But if we do the whole list, all we have left is the Prospector and Mole (due to mining being complete, or is it), and the pure fighters (such as Sabre, Hornet, etc.). And the Pisces (useful little shuttle). I wont count ships that have non functional stations in that (so Vanguard is out, due to having an engineer station).