At least some species do have binocular vision in the direction they attack:
I also realized after my last post that many octopuses have their eyes "stick up" enough in their usual postures that I wouldn't rule out binocular vision there, although I still think octos are less reliant on precision for their strikes than cuttles or squids.
Still, a lot of cephs do seem to have eyes that aren't well-suited to binocular vision. I suspect that's more due to their lifestyles not needing accurate depth perception for hunting, and benefiting more from a wide field of view to see incoming predators. Looking at whales as an example, they largely hunt with sonar, so they don't really have eyes positioned for good binocular vision.
I also think that binocular vision is somewhat overrated, but maybe I'm biased-- I tend not to like 3-d movies, and I can't see those single-image-stereogram pictures, so I seem to rely less on binocular vision and more on paralax, depth of field, occlusion, and the assortment of other cues for that. Really, the only time binocular vision is useful is for things relatively close compared to the distance between the eyes. Try covering one eye and doing tasks-- it's usually not a problem to walk around the house, drive a car, pick up a glass off the table, and such; it's more of a problem for close-in tasks, or rapid response, like if someone throws a ball at your face.
Still, animals like squids and chameleons that shoot out tentacles or tongues to grab food do have a very big need for precise range estimates, and so most of them to have the ability to look at the target with both eyes. Some squid species, like the colossal
Mesonychoteuthis that's been in the news lately, have eyes that protrude a bit to see around the arms and tentacles. In this picture of
Dosidicus gigas their eyes, which give the appearance of looking sideways, are positioned so that they can see forwards when the arms are bunched together in hunting posture:
Many squids and cuttles (I don't know about
Dosidicus but I strongly suspect it) have retinas positioned so that their best acuity is for light coming in from the front (and sometimes back) direction, and even though the eyes look like they primarily see sideways, the internal geometry of the eyes is best at looking forward with both eyes, with the retina tuned to the hunting task on the mantle side of the eyes rather than in the back of the eyes opposite the pupil.