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What’s the point?

Why are their linked nodes that cannot be removed before fighting the nodes they affect? Seems silly and out of place. Just add it to the nodes.
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They could also just add the nodes to the local buffs on each fight, but then it would be less obvious which nodes were on which paths: you'd have to drill down into each node separately. The links have a visible cue on screen you can see, which makes it easier for players to see what nodes are just everywhere, and which nodes are part of a path identity, as @Thicco_Mode states above.