The crystals don't have a preference lens yet. But I'm currently using 1 accuracy + all the rest speed in my setups. In the old version that was the best setup, so I'm doing it that way. I haven't done any tests to see if more accuracy is better in the new rewrite yet. I'm currently doing yellow as the focus in the miners to get glowstone and yellorium, etc... I figure I'll always need those. I'm running purple in the resource miner for obsidian mostly. Obsidian isn't hard to make, but I don't want to deal with it. And I actually ran out of Obsidian the other day when making a big T4 solar.
There are 2 bees one is Blue bee which produces the Gendustry blue dye that doesn't work. The Prussian bee does produce vanilla blue dye. It requires a water bee which I haven't been able to find yet. Water bee would also be useful in making the Lapis bee as well. I ended up just doing the wool + lapis route. Just asked because the only way to produce any meaningful blue dye is to have mass amounts of sheep. I guess you could have a massive hemp farm as well for the string. Just looking for a more efficient way than 1 dye per stack of blue wool.
Like I said, it looks like the only dye that works for empowered palis is the extra utilities dye which can only come from the extra utilities crusher from blue wool/carpet. The extra bees dye won't help here. And for normal blue dye, Lapis is pretty easy to come by.
"vanilla" blue dye is lapis. The dye from Prussian bees is extra bees dye.
Wool is really easy to make. String is the easiest from spiders from a mob farm. Or flax from Actually Additions. (Or a hemp farm). A stack of bones == 3x stacks of bonemeal + 1 stack of zombie flesh == 4 stacks of enriched bonemeal that instant grows the flax plant for a ton of string. You should have a ton of extra bones and zombie flesh from a mob farm pretty early on.
That said, as far as extra bees bees, I haven't gotten to dimensions yet, but I imagine you can only get them there. I tried with the Hiveacynth flower from Botania and I get less varieties than through the bee attractor. And they take quite a bit of mana to generate.
I just don't want you to waste a lot of time expecting any of the bee dyes to work to make the empowered palis. EmosewaGamer can correct me if I'm wrong.
About dimensions. I only tried about 5 worlds, but from what I could gather you can only create 1 world and that is one without any dimlets at all. For me that was a void world with orb features of wood and cobble and dimlet house structures enabled. It also had streaks of dirt with varying tree types on top. I was able to get a tiny amount of ores from stone generated below some of the dimlet houses. I covered a huge part of the map to eventually get the ores I needed. If I added any dimlet to the dimension tab, even only a digit dimlet, it generated a 100% void world. (it has to be noted that this was in the 2.4 branch, can’t speak for other versions)
Some hives did generate on the orbs, but no water bees. I agree that they would be useless for the empowered lapis recipe anyway, blue wool/carpet through the EU2 crusher is the only way for that.