Which would be awful for his character. And also still doesn't explain why a Joker out of character would be the best because it has a chance of being accurate in the future but not really because it would be influencing not being authentic to the books.
The best canon detail about the Jokers origin is there is no real origin and changing that canon, especially for this version, would be a shame. The closest thing to an accepted origin of Joker is The Killing Joke.
I think the Joker has changed over the years, Nicholson influenced Hamill's joker, before the killing joke he was someone that hated Batman ala a bond villain, now he is almost with a story all by himself, like he doens't need Batman to be validated.
I agree Phonix wasn't accurate to the character at all, they just used the Joker name to hype up thier own original story. But maybe that could lead to a blending of the incarnations and lead to new refreshing takes.
Maybe the target audience was never Joker fans but just people in general who might become Joker fans.