Because it’s fun to be tanky. Soldiers gives you ~30% base power damage reduction (relative to Valkyrie), so it definitely helps whether you notice it or not. Soliders can still hit decently hard as long as you are good about stacking might (i.e., purely passively via the Spite line).
That being said, I’m not surprised that you’re having great success with Valkyrie—between the high weakness uptime that certain builds offer, Rise, and the 50% damage reduction from Shroud, Marauder and Valkyrie builds can still maintain high damage reduction with much better DPS than the Soldiers variant. I prefer Marauder’s myself, but Valkeryie is a great choice with the Soul Reaping line.
