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Why Isn't the "All" Feed Different for Each Instance?
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I agree, the all feed is commonly misunderstood to mean all of the Lemmyverse, but this is both a technical impossibility and also a false notion.
What the all feed actually means is all communities subscribed to by a member of your instance.
Especially on thematic, not too big, instances this can be quite interesting and definitely more useful that a bland feed of everything mixed together.
Obviously the bigger the instance, the more the all feed will tend to conform to a bland mix, and somewhat controversially a lot of instances are registered with a bot service that actively auto-subscribes each to other communities making the effect much worse.