I don't think I have one, or at least that I'm conciously aware of. I think the difference is that I don't go into new versions expecting the same thing I got in the old version.
Funny. That's exactly how I go into the new version. Especially if you're talking about comic book movies. The way I determine the quality of a comic book movie is by judging how close it comes to bringing what I've seen and read in the comics to vivid life. This is the main reason I prefer Marvel movies to DC's right now. They've been giving me that great comic book feel for ages now. The DCEU hasn't.
In the case of these comics, we're not talking about adapting comics into movies. These are, for the most part, cartoons created by 2D comic artists being adapted into...2D comics. There is absolutely no reason why you can't tell new stories with the characters as originally presented, and FQ so far has demonstrated that.
So if a comic book superhero who's usually portrayed as a dark haired white guy is given a movie, my first thought isn't "Yay, Dark Haired White Guy is gonna be in a movie!", it's "hmm I wonder if he's going to be Black Guy, or Hispanic Guy, or maybe just Blond Guy?"
All this paragraph tells me is that you take a clinical approach to comic book characters in general.

Okay...
I don't. I get invested in characters. I pick favorites. So if this dark-haired white guy is my favorite character, if I grew up devouring his adventures and idolized him, what I want to see on the screen, like I just said, is what I saw in the comics. So my first thought would be: "My boy just got his own movie! They better damn well get a dark haired white guy to play him!"
I can give you a real life example. My absolute favorite heroes are the Fantastic Four. They were featured in the first comic I ever bought. I had the lunchbox. I watched the HB cartoons. I followed their comic adventures religiously. And, wonder of wonders, the leader, Reed Richards, happens to be a dark-haired white guy. In fact, the whole team is white. The Fantastic Four, in the comics, is four white people. Shockers.
Here's the thing: I'm African-American. According to modern sensibilities that means I should have a problem with an all-white superhero team, but I grew up with this superhero team. I have loved this team for, literally, decades. If this team gets a movie, when I see that movie I'm going to be looking for four white people in the lead roles, and I'm not going to be overly impressed if someone changes one of them to a different ethnicity for diversity reasons, or any reason.
But of course, the FF has had four feature films. The only one with the cast I want was made by the guy who did the toxic avenger and looks it. The two by Tim Story replaced a white Sue Storm with a Latina, and the only logic I can see behind that (because it's not like you can't find a pretty white blond girl in HOLLYWOOD) is that Jessica Alba is a guaranteed box office draw, whereas the rest of the cast was unproven on the big screen. Fine. They got two lackluster movies out of that formula.
Then there was that Trank shit. Josh Trank, in an interview with Kevin Smith, made a big deal about telling Stan "The Man" Lee, "Johnny Storm is going to be black because (dramatic inflection) it's about time." So we got Michael B. Jordan as Johnny Storm. And we got another black actor as Franklin Storm. And we got Trank's movie. Which was shit.
So let's go back. You asked S. if the changes that look to have been made to the Impossibles (an addition and an ethnicity change) would actually do any harm to the story, but that question also has a flip side. You also have to ask if the changes add any value to the story. Look to the FF movies. Jessica Alba playing Sue Storm just added somebody for fanboys to ogle in a tight jumpsuit without making the stories she was in more entertaining. Johnny Storm being black didn't save Trank's movie from being shit. A change that takes nothing away from a narrative is harmless, but a change that adds nothing to a narrative is useless.
I would rather somebody try to make a movie about my favorite white superheroes as they are than try to compensate for a less than stellar movie by diversifying them.