because it was fun - pve threat from the world, this is survival game, not only pvp players but pve too must build their base with potential raid in mind (offline too)
plus random npc attacks give purpose to the army of thralls and pets
now its all gone, in return people get some controlled fun arcade tower defence mechanic, but most of players want to defend their main base from NPCs, not small one (build specially for the raid purposes).
Why should people even bother to bulk defences when no1 is gonna attack ever?

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