All youre doing is making government community level.
What even is a community, 5 people 10, 20 , 100. What is the maximum, couldnt you just say modern nation states are just "communities" of millions. Who decides when a 'community' is to big amd how it should be divided. What happens when a community gets so big they either have to implememt population controls or take neighboring community lands. What happens when 2 communities living next to each other develop radically different cultural paths that inately conflict with each other.
Weve already been through this. For thousands of years we lived like this and barely survived. The moment 2 or more communities decide to work together and impose their will on the lands around them its over for everyone else, whatever the motivation.
More people working together equals more power its that simple. And as soon as times get rough it becomes obvious to everyone, painfully for some and excitingly for others. Simply put, its not scalable and will collapse as soon as any community get larger and more hungry than the others.