But they have done this before. Adding in the basics of what Werebeast have been in the past isn't exactly ground breaking new territory. I think they rushed them in the last minute.
Maybe. Quite a few things in the game feel rushed, but it's difficult to say exactly what the problem was. Maybe since it was so strictly tied to the Companions quest line, with the Companions being the game's Fighter's Guild, they didn't want to force such negatives on warrior characters. Or maybe they didn't feel confident in being able to design the game around the possibility of the player having forced transformations (they'd have to ask constantly "well, what happens if the player turns into a werewolf here?"). If it's completely under your control, it's not a big problem.
I was referring to the so called "differences" between them and other Werebeast. Giving them complete control and taking away their bloodlust will have them killing less people, not more. What is the thinking behind this? How does Hircine benefit?
More followers. Terrfyg and his group would be more willing to turn to Hircine if they had some control of it, as uncontrolled transformations would be less useful for his line of work. Unlike normal people he wanted to become a werewolf, but likely wouldn't accept it if he had uncontrolled transformations and unchecked bloodlust.
That is why I think it was not intended to be fact/lore. Their true nature was left out, they are not finished, in-game, or it is too much of an inconveniance to have them transforming(despite the supposed great AI) that doesn't mean they don't do it behind the scenes, in the reality of that world if you will.
Creating lore isn't an exact process. Sometimes you create lore that you didn't intend, or gameplay limitations can sneak their way into lore (see: the http://www.uesp.net/wiki/Oblivion:Levitation_Act, and the subsequent loss and rediscovery of levitation magic noted in the novels, for an extreme example).
Again, there is no statement to say that they don't have to transform or kill.
Yesterday, Vilkas was telling me how difficult it had been for him to give up his transformations. Until we can pursue a true cure, the twins and I have chosen not to give in to the beastblood. For me, it's provided a clearer head, but Vilkas seems to be suffering a bit for it. Farkas seems completely untroubled. That boy continues to amaze with his fortitude.
- http://imperial-library.info/content/kodlaks-journal
Interestingly, that journal entry was written before Farkas' run-in with the Silver Hand, meaning he willingly transformed after he had given them up. A missed story point there...
Aela stated that SOME Werebeast can't handle it, that means that there are other Werebeast out there just as sane and in control as the companions.
I think she's more referencing the Ravening Lunatics and such you could encounter in Bloodmoon, and the werewolf monsters you could run into in Daggerfall. It's not that other people are in complete control like the Circle, but they haven't gone insane and can still function in society despite what they go through.
That being typed, and back to my point and the point of this thread, the things that are missing are the lunar transformation and post transformation bloodlust(and the other powers of course). All evidence that I can see from past games and Skyrim suggest to me that this is the case and not meant to be, nor should it be allowed to endure.
Lunar transformations and bloodlust have been part of lore since Daggerfall, and Skyrim didn't seek to remove it as evidenced by Sinding. But, for some reason the developers figured it wouldn't work well for players in Skyrim and made modifications to the design, and created some new lore in the process.