Thanks for the explanation! I know you didn't mean your words to be taken that way, so no hard feelings.
Just going to throw this out there, as I've never met these people myself, but maybe there's more to them than they let on. For me, at least, I have a hard time opening up about deep things to co-workers. I just don't feel like it's appropriate at work to discuss anything besides work or something breezy and light. If I need to break the ice, I'll talk about topics like a new TV show I like or vacation plans, but I back away from things that would involve me expressing a potentially controversial opinion of mine that could potentially interfere with my working relationship with others. My INFP co-worker and INTP boss will both go on long rants sometimes about how the country is going to pot or the injustice of this or that, and I never chime in because it just makes me uncomfortable to talk about things like this in a work setting. Those are things I discuss mainly with friends and family, and occasionally other people outside of work. I'm not really sure if this is an ESFJ thing or my own personal quirk, but it could be an explanation as for their behavior, and why us ESFJs just like small talk in general. Gotta play it safe, haha.
As for getting focused in one or two directions intellectually, I guess I can agree with this observation. When something interests me, I'll make it my mission to learn everything about it, almost to the point of obsession, but if it doesn't interest me, I won't even care to glance at it. This means I have a lot of depth of knowledge of certain topics, but not a lot of breadth.