Twin Sticks were released for some previous games. They were released for OMG on Saturn, and despite an apparent over-production of Saturn Twin Sticks and a resultant financial blood bath, they were also released for Dreamcast. Verdict: PRO
Twin Sticks were NOT released for some previous games. They were not released for PS2, despite there being two VO games released. Now, MARZ is not an arcade port so it doesn't count, but OMG was an arcade conversion, so there are multiple considerations, as follows:
* OMG was a budget title, just like VOOT for Xbox 360, so possibly budget titles don't warrant a peripheral. Verdict: CON
* OMG is very old, so it doesn't warrant a peripheral, whereas VOOT is merely somewhat old. Verdict: PRO
* OMG is a niche title, and so is VOOT. Verdict: CON
* After OMG, no further VO releases were planned for PS2, so a controller for one game is not justified. In comparison, (I'm purely speculating now) VO Force might be planned for an Xbox 360 release, slightly justifying Twin Sticks. This is debatable, considering the previous Twin Stick releases were for a single game. Verdict: PRO
* The PS2 is more popular than Xbox 360, so there is a wider audience for the Sega Ages OMG than for VOOT on XBLA. Verdict: CON
* OMG is less popular than VOOT, so the more popular game deserves a peripheral. This is probably debatable. Verdict: PRO
* VOOT is straight up better than OMG. No, this isn't debatable.

* VOOT VER.5.66 requires Twin Sticks more than any other VO, and Sega shouldn't release a game without the necessary controller. This is debatable. Verdict: PRO
* Sega is putting more effort into VOOT VER.5.66 on Xbox 360 than the Sega Ages OMG, as evidenced by the online mode, rankings, and other features. So they are more serious about the title and are more likely to release the necessary peripheral. Verdict: PRO
Anything else?