What about allowing communities to federate with others?
Eg. The mods at gaming@lemmy.ml and gaming@beehaw.org could decide their communities have the same audience and ideology. They choose to federate with each other so anyone that subscribes to either or both will get posts for both. Mods will then work together to moderate.
Then if 1 set of mods decide to change their policies or go in a different direction they can then de-federate and break the 2 communities apart again.