RuneScape, Final Fantasy 11, Everquest and Vanilla WoW were all pretty challenging with a decent populace while requiring a ton of time invested to do a lot of the content, but the whole "Been there done that" from the more hardcore crowd and the "I got 17 full time jobs and 37 kids" from casuals started to warp content design around 2006 -2008. It is also the reason the Moba Genre exploded about 2 years later. I am not entirely sure what is even being discussed in this thread anymore. Raiding in this game compared to other MMO's is entirely optional and it should stay that way. Difficulty tiers already exist with the different wings thus making an easy mode which would equate to pretty much just instanced world boss mode is a waste of developer time. Adding new content to keep people playing is nothing new in any game.