Basically: Resident enfranchisement. It's weird, when people born in our country and having lived here their whole life can't vote outside of local elections. My own father, for example, had a Dutch background, and was never allowed to vote in federal elections until his death. (Neither he nor I even spoke/speak a single phrase of Dutch)
Yes, things have gotten somewhat better and easier with applications for citizenship, but that there are hurdles like that to begin with, is a bit.... weird.
I understand concerns about fragmentation, but recently, I have been more and more in favour of "why not both" as an approach. Basically: One de-facto "central" community, and many local communities. Main reason being, that this will help the Fediverse grow without losing it's "soul" so to speak. Where - hopefully eventually - there will be those central communities with a reddit-like experience for the topic, and then also local ones, where smaller communities around the topic, without the traps of large, "mainstream" communites, can form.