Honestly tho what would make us fight a lvl81 mob? Like what reward or incentive is there to do it if they put it in?
Honestly imo they should just change the whole fate system. Make it like world quests from wow. So that they reward you with like halfway gear or something (ex: ilvl435, 455, etc) so if you don’t want to do the crafting route you can just do fates to get the same ilvl gear but without the extra stats from the high crafted gear. This could then cause ppl to go around areas and fight high end mobs like you suggested but this is just me spitballing.