Yeah, I think it makes them vulnerable. I just like it when telepaths also have cool inner mind powers. ST is loosey goosey enough to presume, and based on Picard’s descriptions; I think they probably segment more deeply, so they are both more easily controlled by the hive, but remain a secondary observer.
That is actually important to their usefulness beyond a non-sensitive Borg: without their splinter mind in the back seat, they wouldn’t even be able to sense!
This plays out as really amazing subversive results that affect the hive, but it in fact reacts to and expects. In order to access their sense data stream a Borg mind has to negotiate subconscious compromises that “infect” other hosts in the local network.
How this plays out with Troirg is having a sense of the emotional spectrum of nearby targets. The more information they draw from their secondary mind, the more two things happen:
- Nearby Borg begin using Troi’s speech patterns
- They begin to ignore “innocent” targets, instead fixating on a particular emotion to track and assimilate
A cube has to account for each of these things when deploying borgpaths. Since the secondary mind is required, each one remains an imperfect tool in the arsenal.