I dont get where OP is getting Unreal is Extreme upsynced to 80.. Yoshi P said himself when it was announced that it would be content between Hard an Extreme.. he said it would be for all players at lv80 to attempt to clear a lv80 buffed version of old primals..

If you read into that thinking that it was going to be super endgame lv80 ilvl500+ thats your fault as it was clearly mentioned it wouldn't be that.

This is a mini game style content with rewards that are leaving.. they want to give as many people a chance to get them before their gone and having the ilvl set to end of 5.0 range is the best way to do that.