I agree with the standardization with respect to Digsites. It also places more value on Archivism Tradition as it'll allow you to do Dig Sites in Territory not under your control with the Agenda helping you find more Digsites that may yield Minor Artifacts to exploit. Meaning if you like Archeo-Weapons and/or want to guarantee that you can complete a Precursor, this Tradition is a must-have. Now as for Precursors, Cybrex is pretty darn strong with a free Ring World(albeit you have to restore it), Mega Engineering(as research option), +10% Megastructure speed, Voidcraft Tech boost, Cybrex Mining Building for Starbases(meh), relic that can generate Alloys in a flash(albeit for Minerals) and Cybrex Warforms for Armies(which are virtually unstoppable). Don't really need to change Cybrex one iota.
First League gives you a Relic World(which you can make into an Ecumenopolis or keep for Minor Artifacts via Archeo-Engineers), techs for Arcology Project for more Ecumenopolis, +10% Planetary Build speed, Industry Tech boost and First League building that can be very strong on a Unity Ecumenopolis. Don't really see a reason to change that one.
Vultaum are also pretty strong. The building they provide buffs the living snot out of Physics Research(base output), Computing Tech boost, +10% Amenities and their relic yields -10% Amenities usage(really strong) and a random Combat buff for 2-5 years when activated. To say they're weak is not really valid imo.
Zroni are strong too but are ideally suited for Empires looking to Psionic Ascend. Yet even if you don't intend to, their relic extends the life of your Leaders via the Edict granted by it. Also can buff your Ships or Planets with a modifier for 5 years when active. The cream of the crop perk on Zroni is their Starbase building. Basically, makes Shields irrelevant, which against Unbidden, is a death sentence for them but with Archeo Ascension Perk, it slowly kills all enemy ships. Meaning it's an awesome Defense mechanism but heaven forbid you lose an outpost with one since taking it back will be insanely difficult.
Baol I don't even need to explain. Awesome for Catalytic builds, free 4 Pops + Gaia world every 10 years(wish it was every 5 but I digress) with Epigenetic Triggers to uplift species or Terrestial Sculpting to get jumpstarted on Terraforming. Yet at the same time I wonder what are they? Genetic precursor or Terraforming precursor?
When it comes to the Irassians, they should be the Genetic precursor. They help with Gene Clinics and Gene Tailoring if you don't have it but outside of that... that's it. They should drastically improve Genetic Modification progress they have planned in 4.0 and perhaps have it spawn Plentiful Fossils Dig Site that yields progress on Biology Techs as well as -25% Genetic modification cost(big boost to Genetics). Seeing as Zroni already buff Leader Lifespan via Edict, how about Irassian relic buffs Leaders by reducing Negative Traits by 1 or 2?
As for Yuht, I feel they are complete crap right now. Their Planetary Decision makes little sense given Terraforming exists and if you Genetically ascend, Climate preference can be changed(or simply get Gaia and not bother). The relic buffs Energy Weapon speed(ok) and +1 pops on colonization. Latter doesn't help when you're likely done colonizing when you acquire it. That means unless you go Tall with Habitats and/or Ring Worlds, you're not going to get much benefit from it. Personally, I think one Precursor should be tailored towards Machines outside of Cybrex. Not sure what I would do for Yuht but given they have a Cryo Core relic, maybe it could do something with respect to Energy or Machine upkeep.
