Setting aside the Te Reo argument, in my opinion the OP is guilty of much of what they accuse others of and appears to taunt others into further participation (again, my opinion). If lemmy.nz is going to become a closed community, it will simply become an echo chamber of that closed community - this is the biggest failure of social media - is that what users want lemmy.nz to become?
Keep it open. If it becomes a closed community, I’ll probably wander off.
I suspect Lemmy will grow (or die) to allow those that create continual problems to be banned or similar - perhaps we just need to wait a little longer for those features? Defederation seems far too coarse/broad brush to me for what I perceive to be, at this point in time, just a nuisance that can be ignored.