Okay, I think the practical reasons you gave are sound. Pre-dividing a userbase into more chunks than necessary makes the site seem smaller than it is. And trying to “force” the same subs that were on Reddit into Lemmy prevents uniquely-Lemmy stuff from forming.
And the “need” for white people twitter is basically “if we give everyone but white people a twitter space they’ll get mad and say it’s racist” lmao. I 100% agree that it doesn’t talk about “white issues” anywhere near the same degree as other communities talk about what they face.
With that said, I’m still not seeing a reason why the sub shouldn’t exist. I might eventually agree that it’s not necessary, it’s redundant, or it’s not funny… But that just means micro blog memes needs to get better posts and drive interest. Both are silly little communities with silly little posts, and each can right for more users.
This is the exact reasoning that Israel is using to justify their genocide in Gaza.
It’s like people get 90% of the way towards “genocide is bad” and then add the asterisk “unless we do it.”