I'm glad that DCE/WB is not forcing all the projects/properties to be connected, because I really don't see the point.
I mean, obviously, MOS, Superman vs. Batman, Justice League, and any sequels/spinoffs, will be part of the same universe, but why should everything be? Why should "The Metal Men" be in the same world, and be forced to work in the same tone, just so they can work in a cameo and say "it's all connected"?
Splitting up the properties allows for more diversity in storytelling and tone.
It also let's the heroes of those separated stories, be the main heroes of that world. Sony's Spider-Man has to figure out how to stop these threats without the hope that the Avengers will swoop in and help him save the day.