Example, Lemmy.ml and Lemmy.world have duplicate communities aren’t connected at all. So we are artificially isolating groups more and making it confusing for would be converts.
Short and too the point
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Most of the time one community comes out as the strongest contester and then that one is mainly used. But people can also use communities on others instances, for example if they don’t agree with moderation. When I started on Lemmy 2 years ago I was also skeptical of this concept, but now I see it as a perk. Regarding the duplicated communities on lemmy.ml, just instance block ml and you are fine.