The DCEU likely will always feature a central timeline that moves the main continuity forward, but investing in Elseworlds stories like Kingdom Come could allow the artists to take more risks and experiment with the medium.
However, Elseworlds don’t necessarily have to worry about that issue because, by their very nature, they exist in their own respective worlds.
Characters can die, they can betray each other, and they can operate in ways that we have never seen before.
Continuity: eventually it becomes a logistical nightmare for any cinematic universe.