I don't know where this "exact same gear as Mythic raiders" comes from, i never said that and seriously doubt that many people want exact the same gear als mythic raiders for worldquests. But people want an item progression outside of higher raiding/M+.
Plus you have the problem of shitty balancing, the balancing outside of these contents is totally off because of the gear.
See all the "Torghast is too easy/hard" threads, People with high end gear can easily solo all of it even on weaker classes, people in quest gear can't. People don't find groups for Worldbosses/Elites/Mawbosses because you can solo them with high end gear but not without. And that is bad because that is the content casuals play.