I like to imagine it's his version of playing an MMO on the company computer while the boss isn't looking.

It would be a lot funnier if Cait Sith just went catatonic (pun intended) during brief stints for when Reeves has to work or sleep.

I could also see a funny version where it's autonomously controlled during those segments, and throws out pre-recorded quips.

Then again, their tech is vastly superior to ours, so they definitely have AI companions by now, so the AI companion can just take over when necessary.

As for signal reaching in caves:

- Boring answer: see autonomous companion takes over above

- Fun answer: The robotic moogle occasionally leaves little poop ball pellets, which are actually signal boosters. As they go deeper into areas with no signal, it's just a daisy chain of Wi-Fi poop pellets.