Yes, I completely agree. Even in a wonderful future people will still have substantial disagreements over certain matters and these conflicts will be more or less severe. And some things will just be annoying. Like travel and communication between different planets taking so long, once they are actually colonized. I think we shouldn’t assume someone comes with a way for superluminal travel or communication: No information transmission faster than the speed of light.
Anyway, conflicts may arise within and between nation states, and along cultural fault lines (religion, adaptation of advanced technology, democracy vs despotism?). Eventually there may be conflicts between p factions. So, I probably need to write something about them next.