It only makes "perfect sense" if you just blindly accept all the bullshit at face value.
There's no bullshit except from you people. Rather than any typical suspension of disbelief that is required for any entertainment media, you try endlessly to find plot holes that don't exist, and you criticize them for doing things differently than Marvel.
That sequence where Diana gets the files and sees the rest of the Justice League on her computer is when I started cheering in the theater, looking around to the people next to me as we all had giant smiles on our faces saying "this is so fucking awesome!"
The movies are actually connected. Not just by having some of the same characters show up and not by a 10 second scene after the credits, but the full movies themselves are interconnected. That's what makes them great, and unfortunately it seems to be too much for a segment of the audience.
You're the worst kind of shill. ---
I have a signature. Apparently this is important, but I still don't have my secret cool kid decoder ring yet.