New stuff HAS to be challenging.. ST and avatars were supposed to hold us over until new xpac but we killed HM grp instance 1st pulling everything with a roughshod grp makeup, then later that night we kill challenge mode final named within first 30 mins of working on it. Avatars? I like them, but only 3 of them and its not enough to keep us busy.
I WANT content to be challenging and yeah, some guilds wont kill it, but you are going to lose the top of your raiding playerbase if you release more sleepers tomb and skyshrine stuff. Now what I want to see happen is less ridiculous checks like power drains or luck based fights where the OT gets charmed, MT gets dt'd and mem wiped mob runs to raid, wipe. I would like to see more stuff like wing 2-3 and hm Underfoot Depths and Roehn Theer.. That stuff was fun and challenging but the thing that made a lot of POW fights hard wasnt the strategy or the moving parts of the encounter it was just the stupid dps checks or tanking checks or healing checks or power checks. This is challenging but it isnt fun and cant be met by most guilds that are trying to raid. That is why you dont even have 10 guilds killing Teku in POW.
TLDR; dont make stuff easy, but make it challenging thru more involved scripts or maybe give options on how to kill it to benefit people with diff raid strengths and weaknesses.