Evilor ran a party today.
We had two members who were moderately A3 geared and four members who were decently A2 geared at best.
We got White Mountain (bunch of goblins, ogres, and treants). We made it through the first two bosses without a huge amount of difficulty. It was definitely challenging, and we relied on some creative strategies to progress, but it is definitely doable.
The server was going down for maintenance so we jumped off the Allod after only one attempt on the third boss. I think the third (out of an assumed four) boss was our gearcheck moment. Tons of adds and heals on the boss.
Don't necessarily need gear to start doing A4, just need some smart people and some good strategy. To finish some allods? Yeah, you'll probably need some heavy gear.