Personal appeal - Please don't make every major boss an instance
Obviously I don't know for a fact that they plan on doing that, but I thought I'd just put it out there that open world content is something that I, and I'm sure many others, find very appealing.
Once 2.0 hits and brings along the new world design, I hope the developers begin to focus on developing content that exists in a persistent state on each server as opposed to relegating everything to the planned dungeon finder. Being able to wander around off the road paths, finding yourself smack dab in a creepy cave full of mobs way to high level for you is a very thrilling experience. Carefully sneaking around, trying your best not to draw agro just for the sheer fun of it. Eventually you'd find yourself in the deepest catacombs, where you'd find a rather impressive looking boss mob wandering around. You'd awe at the sight, before inevitably getting hate and one shotted, still having a blast despite not gaining anything
And just to clarify, I'm talking about both boss mobs/NMs that roam the fields, and those that have open world dungeons built for them; no time limits or secondary objectives, just a difficult journey to perhaps find something cool~
Who else would like to see the same?