There's a lot of leeway in that. So instance I'm going to move some of this to the topic that @Jabba_the_space_gangster linked. But in most cases it's more to do with derailing a topic than it has to do with the ebb and flow of a topic. A topic can always change and that's something that we've seen happen. However there's times where the topic goes way too far away from it's intention or when there's clearly another topic already created where it would fit better.
Since this is still a small topic I don't see any problems.
The reason for moving them to a separate topic is mostly so more people can see them. The more people that can see it the more engagment it potential can have.