I've already spent an hour running around the Cosmodrome, a place I currently have no reason -- aside from this quest -- to be wasting time at. I've gathered easily 50 spinmetal so far and haven't gotten any drops of the 'rare material' I need. There really isn't any reason the drop rate should be this low. This isn't good/fun game design, it's tedious false difficulty meant to take up time. I get that you don't want it to be easy for players to get a better sword, but there is no skill involved in forcing us to waste hours gathering resources. I've seen posts elsewhere where it's taken players up to 10 hours to get everything, and that's ridiculous.
Plus, 500 ability kills, that's a little much, don't you think? (Clever trying to hide it behind a percentage, though.)
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It's for an exotic sword. I get that it's tedious (have all three) but atleast you are guaranteed a weapon instead of relying on rng.