I think a diffusion of communities to better forum software would be the best replacement for Reddit. Why should your posts on r/knitting and r/samurai be link

I think a diffusion of communities to better forum software would be the best replacement for Reddit. Why should your posts on r/knitting and r/samurai be linked together in the same account? How often are people seeing the same person across Reddit communities and it ends up being helpful? The orangered inbox and tracking of karma on Reddit provide some encouragement to use a single site for this all, but can we solve that in diffuse communities? Is karma actually a benefit to users, or should it be hidden anyways?