The 30th weapons are already craftable, if you are talking about the older weapons I don't really see a point unless they are replaced with newer weapons like WQ's or Lightfall's seasonal weapons.
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Yep I imagine most have 30th crafted year/s ago.. its a good point about other newer weapons(would be great) but some of the weapons from Splicer and those older seasons would at least be interesting to farm if they could be attuned or focused.