Disclaimer: First day at 90, so I might be missing something here.
So I just hit 90 and the general consensus I've been hearing is that you "HAVE" to do dailies in order to gear up. From the research I've done, I disagree.
Epics from each faction's quartermasters are iLvl 489. The Mogu'shan Vaults normal difficulty offers iLvl 489 gear. Heart of Fear normal offers iLvl 496. From what I'm seeing, there are no necessary enchants from these vendors like there were from say, Sons of Hodir in WOTLK.
I don't understand why people see it as required to do this when you can get the same gear from raiding. Isn't that preferred anyway vs. just grinding out reps? I don't think I've overlooked anything and from what I'm seeing, this is absolutely false. Just looking for reasons why people believe this to be honest.
This is correct. You don't need to do dailies to get the gear you need to go into dungeons or Raid. I've known of many people now who geared up without doing this (successfully and quickly). There are a variety of ways to get gear beyond the dailies including crafting and dungeon runs themselves.
Most of the items that you can get from the dailies are either available at a lower (read not exalted) reputation or are just not necessary and are more cosmetic or fun items. Just doing the normal quests through the zones can also get you easily into Heroic dungeons and on.