As Dwayne McDuffie said some of that stuff can't be put on screen from the comics.
Be it story cue to certain special effects.
Stuff like Sinestro War would have to be watered down and exclude some folks.
Star Girl could get away with it.
It's called having more freedom and certain things like interference is a lesser issue.Funnily enough Gunn and Johns have very similar sensibilities, both of them prefer the B/C-Listers over the A-Listers, so we’ll see if Gunn can succeed where Johns failed.
And certain changes probably don't happen.
In other words-the bosses would have you make Jimmy Olsen black versus using Ron Troupe-whose already there.
If it was Booster Gold-that wouldn't happen.