RNG is painful when it comes to desynthesis. I've been through over a hundred items and never come across a mastercraft demimateria. I wouldn't be so annoyed if I didn't need THREE of the things to get my upgraded tools.

I'd really like failed desynthesis to give a small skill increment. Even if its 10% of the normal increase it would be a vast improvement than breaking 20 items and getting nowhere (that was with 48% success chance too!).