You can never have that again, even if you refrain from looking anything up, because you simply can not forget everything for one, just impossible.
And also, part of it stemmed from the fact that we had not seen anything like it before, UO and EQ simply did not compare in combining the MMORPG game play but at a much more active and fast pace with, for at the time, fantastic artwork and a nearly seemless world, with only a few places that you actually had to zone (load a level) and that part you could not even duplicate with a Kid who has never seen WoW because he has already seen 100 other things with a whole new modern level of art and such. (Not sure on the gameplay sometimes these days)
Aside from that, there is not much that is not the same or close as possible, none of it really changing the game for me.
Server capacity is much larger.
API has evolved and wont be regressing, for good reasons
(still wish they would enable focus though)
Radial clutter adopted physics borrowed from retail.
No bearing on gameplay, but i’ll take it, i looks nice.
Spell batching does not seem a 1:1 duplicate but i knew to expect that
they warned about it
Most of the google-fu stuff stems from the fact that people seem to pick
patch 1.xx and say “This is vanilla, patch 1.yy is not” and then the proceed to pose one aspect of one patch vs an aspect in a different patch.
All of WoW from 1.01 to 1.12.2 is Vanilla, it has nothing else to be until it becomes TBC, and classic is 1.12 (and i guess final revision .2?)
It wont be “perfect” unless they run the servers off the legacy code (which they have) and compile the clients from the legacy source (which they also have)
I am not sure about the host side, but if WoW 1.01 of the CD is any indication, a legacy wow client in 1.12 flavor wont fly to well on my windows 10 PC with modern hardware, too much squirreling around to even get it to render.
And even then, there will be a laundry list of stuff that people will find, that was never fixed until some 2.x patch in TBC