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Ok so I recently hit level 80. I finished up my main story quest minus the dungeon boss at the end.
I enjoy exploration, so I decided I'd go back and explore all of the zones I missed on my way to 80. I figured with this amazing level scaling system, these zones would still provide challenges and I'd get to explore.
I was half right. You can definitely go back and explore zones, same as you can in any other game. Where I was wrong was thinking it would be any challenge at all. I have yet to find a mob, Veteran, Champion, Group Event, or otherwise that isn't absolutely demolished by Hundred Blades even though I am scaled to their level. I literally feel like a level 85 running around in the lvl 10 zones in World of Warcraft demolishing everything in my path.
So I ask, what's the point of level scaling? Events give about 2k xp, compared to 18-20k at my real level. Items that drop are based on the zones level, not yours.
The only events that I know of to have scalable loot are the later on dragon meta events - The Shatterer, etc.