QUICK ANSWER
Keep an upgrade when it improves a measured outcome on the same route. The current released baseline remains v1.01.05; the planned level 90 items and about 20 new Unique Stats need final notes and testing before they can change this guide.
Evaluate an item in context
- Name the stage or activity it should improve.
- Test before and after with the same build conditions.
- Check whether the new effect changes Rune or skill priorities.
- Record the game version and item state alongside the result.
Planned gear context
The Aug 19 official development note announces level 90 items and about 20 kinds of new Unique Stats for the planned update. It does not publish the item list, stat values or sources yet.