I noticed this too. Makes the orcs expand too slow and they end up being taken out by adventurers before they can really horde to counter the better tech.

I believe on modder said during the Anbennar DEv Clash from Paradox that greentide wasn't implement yet

Hopefully more is coming. I like the idea of orcs and humans expanding in different ways, but right now it is just astoundingly slow.

It is WAD that Siberian Frontiers dont gain any bonuses from settler chance and colonist growth bonuses.

I am not sure that it is working as intended for this mod.

Would be much better if orcs and goblins just get the same colonist bonuses as human adventuring companies, and leave the siberian frontier to some nations which will appearl ater on the still empty 'wasteland' continents

Did anyone ever get half orc or half elf as primary culture somehow?

So I've played as orcs quite a bit the trick is to combine war with the settlers and I think I also invested into normal settlers as well. You do get a slow start but its all about growing big fast so the rest of them don't wanna mess with you. To be fair tho I haven't played in a couple months

Siberian frontiers have been intentionally nerfed in this mod yes. They don't get bonuses from settler growth or anything, and their base rate is very low.

At this point siberian frontiers make playing orcs extremely op. Us the frontiers to expand to land border another country, use your orc estate to get the huge mil bonuses attack them and full annex using monstrous cb. Repeat this process using siberian frontier to get border another nation then attack it. Extra diplo can go to random provinces not bordering anyone. Using this method you will have 12-20 provinces growing under siberian frontiers