Okay so I did a stat comparison between DL and AF2 gear:

Darklight

Int: 77
Vit: 76
Crit: 43
Det: 16
Ss: 49
Acc: 59

AF2

Int: 112
Vit: 94
Crit: 55
Det: 34
Ss: 30
Acc: 91

There is a difference of 35 Int/12 Crit/18 Det between DL and AF2. Compare this with Relic+1 (3 wpn dmg, 4 int, 2 det). That's why it's more attractive for me (who is not raiding Coil atm) to get 3 pieces at the onset and then the last 2 pieces following that. Just the first 3 pieces ALONE is a massive upgrade from DL. Do the additions yourself (head+chest+hands vs chest+hands).