In that case, we start getting into the “Lemmy is not Reddit” issue. Tildes is a “small by intention” reddit clone, and Squabbles is a “dude hopes to get rich” reddit clone, but both are self-contained; they have different issues than the threadiverse. For Kbin in particular, I have seen people noodling around with mockups on how to present identical URLs in a sort of nested way so the user can pick which discussion thread they go to, and that could be helpful, but at a certain point you either accept the annoyance of redundancy, possibly hoping it will fade as communities evolve, or else you unsubscribe from the source of that annoyance.