Its not prefacing it with a summary, its letting them know you have a point at the end they should wait for.
I actually prefer the type of conversation that goes back and forth and tangents, but there is a place for more long form cohesive ideas, and you should wait to hear it all before speaking.
I think the part people leave out is that not everyone has the same goal. Most describe it as being "happy", but never consider whether thats even possible to be happy nearly all the time.
The flaw there as I see it is that humans seem to always return to some sort of baseline emotional state, but this state is not happiness. Happiness is the spikes up while sadness are the spikes down, but given enough time it always comes back to baseline.
Thats why you can find really extreme examples of happiness. Some of the time I spent in jail were truly happy times, which really confused me at the time. On the other side you might see people become depressed during or after achieving their goals.
In my opinion, having the wrong expectations for how you should feel and for how long, can turn small curable problems into consuming destructive problems.
It should be: time plus perspective heals all wounds.