7 years ago
This is true, although the original Drone appeared to have a similar vision cone.
I say this mainly because of the scene where Ripley peers across the corner, and sees the Alien. If the Alien didn't have a cone of vision, then I would have seen (and killed her) immediately.
Also, at least it keeps the capabilities of the Alien. Its not like ALIENS or any of the other games where Aliens appear to only be a threat in numbers.