So after the update 139-141 i obtained the Chakra Purge from the Clan quest and i max Cons and Dex but didnt max Str while my weap requires 315 of it and i only put 202. Am i going to have a disadvantage on the weap or should i keep it this way?
You will have to repair your weapon more frequently than someone who has the stat requirement. Most of the durability loss comes from not meeting the level requirement though. Damage difference will be minimal to having the required strength to use it.