It’s a sticking point because it’s new to people who only have experience with reddit after it became more mainstream. Lemmy, Kbin, Mastodon, etc. and how they all work together isn’t a super simple concept. For all the shortfalls of a centralized social media website, the prevention of multiple separate communities having the exact same name is convenient and simple. It prevents duplicated posts. You want to capture all of the traffic in one place. That’s why link aggregation sites and blogs exist, so in order to do that you have to subscribe to all of them. But then there’s a pretty significant chance you’ll see the exact same post cross-posted to the other 3 communities…which would annoyingly bloat your feed obviously.