I think a few of these recent changes have been a bit disappointing..

Materia:
Level 70 - 90 gear is no longer guaranteed to convert into level IV materia. There was already a shortage of level IV materia, I don't see how this is going to help anyone.

Primal Weapons can be exchanged for GC Seals:
Now everyone will be rolling on weapons they didn't previously have any interest in, to exchange them for seals. This will effectively make it harder for people levelling desynthesis to grab the weapons they're looking for, and lessen the already small supply of Demimateria (i.e. the level 95 gear will be even more expensive to make). Wouldn't it have been better to make these fights reward you with a small amount of GC seals instead?

Hunting:
I'm not sure if making B ranks effectively worthless (for most of the week) was the best fix. Now we have 17 fewer targets to hunt for, but just as many people looking, making the rush of people going after every A rank even worse.