Sometimes it is the case that the N is simply talking about abstract matters and the S is simply talking concrete matters, but I’ve noticed that sometimes S types are just using concrete examples to hint at the underlying concepts or patterns they see instead of articulating it directly using abstract language like Ns usually prefer. To an N who prefers abstract communication, it can look like the S has no point and is just focusing on trivialities/details, when in reality they may just be more comfortable expressing the abstractions in their mind in an indirect way using concrete language.
Maybe this has nothing to do with the interactions you’re describing - it’s just something I’ve seen enough that I thought it was worth mentioning.
I think I do use concrete language pretty much all the time, I actually don't see much point in doing otherwise because I want to be comprehensible. I'm pretty sure I do what you say, in that I'll use examples or situations to point towards something larger, though I think probably the 'larger' is left unsaid, or I hint at it with my voice drifting off. Ni people usually know immediately what I'm alluding to, and that's probably a fail on my part with Ne people, assuming they'll pick up on it. I think it's true though, I keep most of the larger patterns/etc in my head; from my pov, what good is talking about a larger pattern without the examples, the tangibles, to support it? I think everything for me starts with observations, which are what substantiates a 'trend' anyway.
Actually I hardly ever give details, I have found NeSi to do a lot more detail sharing. I suspect though 'detail' is being thought of differently between different people. From my pov, NeSi can go on and on forever with details of particular things they're describing, and adding more 'detail' doesn't add anything new (from my pov) to the underlying thing being discussed. Whereas I'll just make succinçt observations or 'summaries' of what happened, which leaves a lot of people feeling completely devoid of anything, ie I don't give enough info to complete the picture they are wanting to hear about.
I don't know, we're all different in how we talk and what we stress/find important. What I mention will seem trivial to a lot of people, just like what other people talk about might seem pointless and repetitive to me.