More than that, every community from every instance can be synced but why they didn’t do that in first place? Probably because not overloading instances.
Even though I’m partly doing it now, automating it is kinda daunting. I’m sure this tool will change in the future, but I would prefer to collect ideas rather than perform them in the short term :)
I am thinking about adding “tag” feature to let instances pick what tagged communities they want in the future but I can’t promise TBH.