In DA, tiny and small hulled ships are of even more dubious value:
* They can rarely ever be fitted with more than one engine and still have weapons, and therefore be speedy as someone above suggested, because of engine sizemod/speed nerf. At least, not untill youre nearly maxed technologically, by which time, it would be foolish to throw that much costly technology on a small hull which is not going to survive any real military encounter, and not neccesary to kill 1 HP troop/spore ships, and defenseless starbases.
* They dont have enough HP to survive battles, or hullpoints to stock significant defenses, and therefore gain HP through experience.
* Massed fleets of small ships are no longer effective in DA, except against other fleets of small ships. A larger hulled ship will tear though entire fleets of small vessels in the new combat system. The best you can hope for is to sacrifice an entire fleet of smaller ships to take out a medium or large ship. ( This makes me wonder though if small ships might be useful with the Arcean First strike ability where the larger ships dont get to shoot back).
* Youll inevetiably have a few dedicated planets doing your warship production by mid game. Youll find that from one of these planets, a medium ship costs maybe one or two turns more of production than a small hull, and a large hull 2 turns more than a medium hull. Under that kind of cost/efffectiveness math, its hard to justify the creation of a small ship except in the most extreme situations when those one or two turns really will make a difference. Especially since small ships will rarely ever survive combat, even against warships with half their attack damage.
The only three (non-emergency) reasons to ever build small/tiny warships remain:
1) You cant build larger ships yet.
2) As an inexpensive token defender against spore and troop ships for a planet that will probably never see any real threat.
3) As a novelty for personal satisfaction, while you wish that the game had clearly defined and compelling reasons to build small tiny hulled attack ships, maybe for use on ...(whispers conspiratorily)...a carrier. But wishing dont make it so.
As for the above assertion that "no one hull is better than another", thats absurd. Otherwise we'd get all the hull types at once without having to research them at considerable effort. The larger hulls are clearly meant to be better in GC. This may not be true for "science fiction" in general, but it is for the game.