The whole premise of this question rather confuses me.
First, it's been a while since I exposed myself to listening exercises, but I remember many of them doing exactly something what you say doesn't happen, summarizing things at the end and often going out of their way to phrase things in such a manner that the listener would be thrown off unless they understood a particular piece of grammar.
Second, I'm not sure why one would expect artificially created listening exercises to be a perfect mirror of actual conversations between native speakers. Listening exercises are created specifically to challenge learners to understand particular points. I'm not sure why you'd expect tendencies in them to perfectly mirror and represent exactly what happens between native speakers in all of their daily interactions.
Third, I've never felt that summarizing things is a universal property of every English conversation. It strikes me that people summarize when they expect that there might be a potential misunderstanding or lack of clarity. It's not like there's some unwritten rule that every English conversation has to end with a summary.
So in summary, no, I wouldn't say there's any significant difference between English and Japanese in this regard.