Recording ideas from IRC:
High level, or just crafting in general, should be more of a web then a line. Given creative freedom,and the range of worlds that can be put in (specifically all the biomes you could get placed in once we get those together), there should be many ways tools and materials are interconnected. For example if you start out in a desert, there should be a way to at least do some basic stuff with out wood. (perhaps weak reed tools). But again this shouldn't be to say that all biomes are equal, there should be intresting things only in certain biomes. (for example some kind of ice/snow things in the coldeer. Perhahs a whole branch of bee keeping if in the right forest. Special crops garner special tools. Perhaps volcanoes are good forges, and in that case, can be used to to by pase the manual creation and crafting of things like furncaes and ovens, etc.
A big problem in large minecraft mod packs is too many items, transitional items, not in house syndrome, and objects being single purpose/only useful at a certain level.
We already combate a decent amount of NIH by our libraries/frame works (keep at it, they're quite nice. Still need nuggets, blocks, liquids, dusts, and bars for every ore we have), but a larger problemis transitional items. They are items only used in one recipe, usually just another item, and they have no use or other purpose. (for example creating ion thrusters for power armor do nothing themselves, they are just parts of another even more complex recipe). As well as certain objects being to tiered. (which was adressed in the first section). Sure some of the higher levels are advanced, but many parts of them should have other uses, perhaps as blocks or weapons. Perhaps you make a Cauldron for/from some high level magic. It should still be useful to boil your potatoes in, or use to store random liquids. How ever that is not to say tiers are bad, they should still exist.