If only Materia IV are used then you only lose 3 Craftsmanship each on 4 Accessories. It is EXTREMELY unlikely that there will be a rotation that hinges on that +12 Craftsmanship, especially considering the most popular rotations at the moment rely on Piece by Piece and Maker's Mark + Flawless Synthesis, both of which do not scale whatsoever to Craftsmanship and merely become stronger the more Progress a Craft requires.
Materia IV can be brought back by airships, and assuming 2-Stars materials will be more accessible through gathering in the Diadem we should have a viable route to Materia V as well, though I highly doubt there will be a decent number on the market for at least a month after 3.1 drops.


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