Why are people so opposed to harder content anyway?
Why do hardcore players have to compromise themselves for casuals?

If a lot of people can't beat extremes or coil at the moment, what's the harm in adding even more challenging content? Like something tiered higher than coil.
It could be nerfed twice, once to coil difficulty and once more to casual difficulty. Or rather nerfed after a longer period, after 3-4 patches.