Four years ago, in Dev Diary #146, the game director said they were planning on changing the existing precursors (First League, Irassians, Cybrex, etc) to use the archaeology system that was introduced alongside the Ancient Relics DLC, instead of the current anomalies system:
Is this still planned to happen some day?Additional precursor plans
Some of you have been asking about archaeology and adapting some of the old precursor content to use the new system. In regards to that question I will say that it is something that I always planned to do, but due to other things taking priority we can’t promise that it will happen immediately. If those changes don’t make it into the next update, it's very likely they will appear in the next big update after that. Changing that content would of course still be a part of the base game.
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