The current crafting system is good, as an isolated part of the game, however there are mechanics that are not used very wisely by the production team.

e.g.
GC craft turn ins: these (still) give yu a (poor) amount of GC seals. Why are we still left handing in L48 crap? This could have easily been expanded i.e crafted i55 hand ins from the other page and raise the GC seals/your tome idea
Ixali craft turn ins: NO OAKKNOTS?

Personally, my FC do Coil runs only to MB the crafting materials for a Larger house, if I want these materials to craft I will have to do a DF run with a random party and hope I get lucky when I roll. Saying that, MB mechanics tradeable/untradeable seem to ALWAYS dictate where crafting goes: EHCATL SEALANT (even though it technically still is not going anywhere and is a huge question mark for the production team who after a year of being live, still HAVE NO IDEA how to truly bring DoH into the rest of the game)