I mean, I think it really ultimately depends on how you define gen. I think it can be a pretty useful tag, especially when you're dealing with long simmering couples in canon. If a couple is not together, but there's clearly UST and you've tagged it with the ship, I think you're almost obligated to mention that they're not together together in the fic.
But mostly, I think it's a different strokes thing.
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But mostly, I think it's a different strokes thing.