This is best explained by the following quote from Geoff Jones in October of 2014 when asked how the DC Extended Universe would compare to the Marvel Cinematic Universe:

> "We look at it as the multiverse. We have our TV universe and our film
> universe, but they all coexist. For us, creatively, it's about
> allowing everyone to make the best possible product, to tell the best
> story, to do the best world. Everyone has a vision and you really want
> the visions to shine through...It's just a different approach."