It’s a tell in the marketing and the decisions that we know so far
Making Jonny black shows that they are wiling to sacrifice the source material to please certain real world expectations, in this case the minority issue, by complicating it unnecessarily. Can you think of any reason or benefit for making Jonny black? Is there going to be some sort of point or commentary going on here? I highly doubt it, more likely it’s just here to be ‘progressive’.
The turn towards realism makes sense where the main enemies are down to earth style enemies, such as crime lords, thugs, and spy rings. Human things we can get see in reality. Fantastic Four are the opposite of realism, with dimensional hopping, giant space gods, hyper megalomaniacs, and mole monsters. It’s not meant to be grounded in any form of reality, since there is nothing comparable in our reality for them to draw from. This not only implies a film trying to adapt and mimic other films’ success(coughBatmancough), but shows a lack of connection to the source material, as well as interesting choices to MAKE it seem more realistic(such as Thing and his missing pants). Grimm himself is another good example. Ben Grimm hates his condition yes, but has a delicious NYC attitude and accent, as well as being an excellent charming and blunt foil to Reed’s hyper intelligent drama. Instead, Grimm has mostly been seen with a pissed off face in action shots, even as a human. And I don’t think he’s said a word. Given the direction this film is going, this probably means that instead of this:
https://www.youtube.com/watch?v=sGEKYrX3iA0
We’re gonna get ‘WAAAAAAAHHH I’m a monster who has super powers! Someone feel pity for my nonexistent normal life WAAAAAAAAAAAAHHHHHH help me Reed! WAAAAHHH I hate you Reed’
Furthermore, while trailers are not indicative of quality, the ones we’ve seen show stale and unfunny jokes with nothing new in them. The entire trailer explains the entire movie, which reflects what is likely indicating how straightforward the movie will be. The trailer is trying to assure us that they will be telling the story of the Fantastic Four, something that they are not confident enough in just by having it at the end of the trailer. Compare that to lets say the Age of Ultron trailer, which had a mix up jokes, a serious overtone, left us a few questions, and gave us what we were expecting any maybe a little more. Rather than pandering, this trailer is confident in what it is and is proud of it, while the FF one struggles to validate itself. Why? Shouldn’t it being Fantastic Four be enough? It implies desperation, like it’s going ‘NO PLEASE COME BACK! SEE, I’M THE FANTASTIC FOUR!’
These are the things that are there, between the lines, that people can either see or sense that just imply that the movie is trying instead of being Fantastic Four to be what Fox thinks is popular with a Fantastic Four skin over it.