@Thenomain For sure. Despite my username, I've ironically played way more AW & PbtA games (mostly Dungeon World and Monsterhearts) than I have Fate.
The unique nature of each PC is certainly an obstacle, although some lend themselves more easily to being "one of many" (e.g., choppers or gunluggers) than others (how many hardholders would be unsustainable? probably even a single one for a MU*).
For me, I think one of the other big obstacles is making sure players feel empowered to contribute to the game world by inventing details (whether in the role of player or MC) that can then be used by others. A wiki is an easy way to try and help everyone keep tabs on this, assuming the playerbase buys into its use. But I don't know if they would.