Other than bragging that you're doing T6 there's absolutely no reason to bother with it. I used to solo T4 and T5 until I realized how utterly pointless it was. I still firmly believe that nothing can compete with the split T1 farming that I was talking about yesterday--and all you need to do that is the best dps gear you can find, because you don't need toughness in T1. I don't care how much gear someone has, they aren't killing as many elite packs and rift guardians on T6 as someone split-farming T1 is going to kill--even taking the 15% per level bonus into account. That doesn't help you with the shard side of the farming at all anyway.
Sure, they might fix that eventually, but I think it's also just as likely that they will tone down T5 and T6 like they did Inferno.