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Honestly, I think the vast majority of 'desync' issues would be solved if they just automatically resynced you if you're stunned.
Play a character with Unwavering vs a character without, and the difference in how often they 'desync' is remarkable.
You
are resynced when you're stunned.
https://www.pathofexile.com/forum/view-thread/403446
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We've added some experimental code that triggers a local position resync if you are stunned while desynced by more than around 2 metres. The goal of this change is to catch the situations where you are pinned by monsters on the server without being able to see them on the client. This is a low-impact change that should prevent some avoidable character deaths.