What do you mean by "Skyrim wasn't finished" ?
Do you mean that they didn't do everything they planned to do in the game (including or not DLCs), especially scriptwriting elements ?
Because it is indeed well known that Skyrim wasn't finished, but because it had many bugs, not because there was lacking content (especially scenaristic content). Some game mechanics (like mounted combat or housing) could also be considered as things that should have been in the game at launch, but that's hardly comparable to story elements.
Additionally, if I remember well, there is a DLC that deals with what the Falmer are and what they used to be. I think if Bethesda wanted to say something about savage Falmer, they would have done it.
Falmer are not really wild beasts (I don't think anyone said that), but they don't look more "civilized" than goblins, ogres or giants, and those are not considered as "civilized" enough to played in the Elder Scrolls game or in this mod.
No, I meant storyline. Skyrim was missing some large parts, namely the Guild Questlines, some of them were not quite complete, and this is in large part leads to the College of Winterhold off the top of my head. The questline was largely underwhelming I remember, and looking back there should have been more. Back when I did digging and was more into the whole forum thing I found some sources that led to speculation that the College was supposed to actually tie into the city's destruction. It made no sense for the Red Year to be Winterhold's destruction, and it was supposed to be explicitly related to the College, rather then it just be random rumor amongst the townsfolk.
Now you could debate this, debate that the College questline was complete, fine, dandy.. but I would argue that there is something going on. They have said something about Falmer! but the reason you cannot play a Falmer is aesthetically, they look nothing like other races, and they serve as a classic antagonist. Their entire way of life is different than many other races.
http://www.uesp.net/wiki/Skyrim:The_Falmer:_A_Study - This is perhaps the most factual evidence that the Falmer are not what they seem. They had led a full on war against the Dwemer, and their sophistication is known to be growing.
The Falmer torture their prisoners, something that could be described that they find joy or some type of leisure out of this. Falmer have actively domesticated Chaurus and Skeevers(even giant spiders), acting as cattle, because of this they are nomadic and often are traveling all the time. They can construct buildings, resembling tents, all of their own craft-work unlike goblins who steal. Everything the Falmer use, they make. They have an aptitude for Magic, and, surprisingly, Alchemy.
The females use Staves, why would they do this, if not to signify their status? This is seen with others, where they have an order of battle, often using a few Falmer to lure the prey into a trap sprung by having other Falmer close the escape path by jumping from a cliff.. Or stronger Falmer lurking in the background, using their magic as normal Falmer take in the front line. They have a Chieftain figure, who has better armor and weapons than normal Falmer. How could these things exist without some type of language, or cultural ladder?
They are able to farm, I've seen many mushrooms explicitly planted near their huts, as well as pens of Chaurus, this represents some type of ownership, they could be an entire rule of law we have no idea the Falmer follow. They have created urns to hold liquids in, and most peculiarly, even though they live so near Dwemer ruins, they use nothing of them. Why would they do this, if not for some type of pride, or, perhaps, they
know what the Dwemer are. This could be another meaning that the Falmer have some type of system of remembrance.
This all points to a civilization. A primitive one, sort of like that of Native Americans.. Or the
Steppe Hordes. Now, do I think Falmer should be able to invade all of Tamriel on a weekly basis? No, but they should play a larger role in the Skyrim region. The mechanics are there so they could play differently than other government types, so they could be as distinct as they obviously are. Just like how the Orcs can never remerge if they are conquered, the Falmer can never pop into the world following a crisis, a weakness of the overground! This is but a suggestion, but one I stand by.