At level 77, people (playing the overpowered classes) are still having troubles doing TOSH hard. So that's a 7 level difference.
Not every idiotic combo can do an instance just 5 levels below them. It seems like a fair indicator to me.
Also, if you look at the end they get a chest piece with an orange stat, so I think that is also a fair indicator of it being hardmode.
All idiotic combos can do instances 5-7 levels below them. Its not the difficulty of the instance, its the capabilities of the player(s). Sorry Palenque, but you're forever behind, and its nobody else's fault but yours.
At lvl 70 (or 72, dun remember) I was tanking and trioing GCH as a D/Wr with 2 rogues (except annelia ofc).
Even nowadays, KBN is easy. If you're not clearing with all the access to orange stat opportunities given by Charityforge, a level cap increase with the higher stats that come along with it - you need to either 1) gear up, or 2) learn your class and learn to play.
Someone somewhere mentioned 7 hour KBN runs on my server, and they don't even clear. Unless that was exaggerated, its pathetic, and theres no excuse. Especially this late into the chapter. and over half a year since that instance was released.
But this is just me being my blatant, elitist self.
Once Ch6 releases I expect 2 maybe 3 guilds out of the US clearing within the first 1-3 months. Then a few trickling in after that, most likely 4-5 months after the instance is released (and not until
after they buy gear from the people already clearing, in order to clear themselves.)