Ukraine as a state has no geopolitical meaning
True
Ukraine as an independent state with certain territorial ambitions,” he warns, “represents an enormous danger for all of Eurasia and, without resolving the Ukrainian problem, it is in general senseless to speak about continental politics” (p. 348). And he adds that, “[T]he independent existence of Ukraine (especially within its present borders) can make sense only as a ‘sanitary cordon’…”
True
Same is true for many other 'countries' .
Think about all the headaches we have now because anyone with a domain can send spam emails to you. Email would have been much better if there were only a few, or at best, a single email provider. In fact, the reason why email is usable today is because we don't treat all domains as equal and put more trust in a few providers. The concentration of email users into a few domains is what allows it to be used by so many people today.
But users from other instances can still interact with local posts.
I didn't mean to single out any particular incident or group of users. I was attempting to make the point that federation is a major roadblock to the ability of every group of people to block "outsiders." Other important needs of people are also hampered by federation (for example, discoverability).