They currently cannot fix desync with the current game client/engine. They just don't have the money to pull of an entire rewrite of the code to do so. Maybe in the future for PoE 2 they will, but not anytime soon.
- Fixed Desync?
Everyone I know (including myself) stopped playing PoE a while ago because of:
1. ** Desync ** <--- #1 Main Reason
2. Waiting for Act IV (won't bother to come back if desync isn't fixed)