Does that mean that having gear of item lv above 80 of the same kind of stats (say: STR with DET and CRIT) is in no way more useful than having the same kind of gear but of item lv 80 ? An item above that level will have the SAME exact values when sync'd as an item natively iLv 80?

Cause when doing FATEs or some low level dungeons I noticed people lv50 with some high level gear when sync'd have much better stats than my own. I guess it's the quality of the gear in that case.