Re: TC and BM; they very much belong in the pack, you're interpreting the cataclysm that precedes Regrowth quite differently to what it is. From what you're saying you seem to think its along the lines of a nuclear fallout (I'm guessing possibly due to prior association of the wasteland with the Fallout games, which fyi I've not played a single one of). The lore I've built into the pack however is that it is very specifically tied to the absence of ore and how that came to happen, and is actually a magical desolation type event, not related to the tech side of things at all. Regrowth is definitely more heavily tied to being a magic pack than a tech one, and that's very much on purpose.

As for automation options for Agricraft; In 0.8, TC golems, Forestry multifarms, BC robots, and BM Ritual of the Harvest Moon(not 100% that's the right name) are all capable of automating Agricraft.

The Spirit World is something I don't have much control over. It's generation is very specifically a mirror of the overworld (think of it more like an out of body experience rather than a dream), hence why it too is a wasteland. However, there is grass there which I generate with COFH core (always has been in the release versions) and ores, along with living saplings dotting the land too.