Hello DamagedGoods,
Let me preface this reply by stating: I have been diagnosed with ADHD in the past, but eventually went off the meds (the required dosage was too high and totally depleted my appetite, so it was doing more harm than good) and the symptoms have lessened over time (whether the condition has passed or I have adapted to it I do not feel qualified to say, so I'll let you be the judge of that). As such take what I say with a couple grains of salt as to how it applies in your particular case.
I do have a certain reputation for just going on and on on certain topics if allowed to keep talking (basically if the conversation is getting interesting I prefer to keep pushing deeper than change topics), so I can identify with your statement.
However, I would not consider such things "important", just interesting, and don't usually speak about any actually important things with anyone; as such, condensing my arguments is usually not a big deal.
What, if I may ask, do you mean by important? Can it be that others merely do not get how much the topic matters to you? I mean, if to them it's just a matter of "what's 1+1?", they won't really feel like they need to hear a couple paragraphs to get the full picture

.
"Reader's Digest Condensed version."
I just might steal that.