but that's kinda what they were doing before... then Marvel changed the game.
They could have easily made a Superman trilogy and a new Batman Trilogy and worked on some other stuff, and when they got to The Flash trilogy, they could have done some Earth 1, Earth 2, Earth 3 dimensional portal hopping, crisis on infinite earths thing joining forces beat a global threat. if they still really wanted to connect it all. But what they have right now is a mess and it's only 3 movies deep, with 2 more on the way this year, and at least 1 planned for release next year as well.
If they want to move forward connected or unconnected, they still need to figure out what they want to accomplish before they start putting too many pieces in play. If they are really trying to justify a separate studio approach with DC Films, then they still need to make sure their business model is sustainable before they bankrupt themselves with too many projects on the table before they are sure their direction is truly profitable. I'm aware that BvS & SS alone have probably made enough money to fund the next 3 movies, but if WW under performs, and JL fails to meet expectations, they still have Aquaman and 5-6 other announced movies in various stages of pre-production, making it very costly to start a massive scaling back.
That Marvel $$$ is very tempting, and I don't blame them for wanting to follow the model and have a built in audience that's GUARANTEED to follow you from movie to movie as they know they are all semi-sequels to one another, but these movies still need to make sense, and more importantly be good. They won't all make sense if they just have random directors doing what they want with the characters and then superficially adding in connectivity scenes just to say "oh hay, see these are in the same universe" but other scenes kinda contradict that very thing by being inconsistent with another directors portrayal of the same character, event or timeline.
and just for clarity, I left out another movie that's been announced so I'll make a list:
Wonder Woman
Justice League
Aquaman
The Batman
The Flash
Justice League 2
Suicide Squad 2
Gotham City Sirens
Green Lantern Corps
Man of Steel 2
Nightwing
Black Adam
Shazaam
Cyborg (cancelled?)
That's 14 announced but unreleased movies in their Cinematic Universe when they've only released 3 so far, and only 1 of those reviewed decently even if all 3 of them made money. They should have only announced up through Justice League, which probably should have come after The Flash and Aquaman. I know they want to generate hype and let everyone know there's a future in this DCCU, but I think they just have their fingers in too many pies at once, and the whole project will suffer, especially as they didn't have a clear cut trajectory before they announced a majority of these projects.