Let me be clear where I stand on that point:
I totally dont mind that theres a black stormtrooper, a female lead, I dont mind that theres divercity in media, what I am saying is, not everyone wants that, I myself, dont mind it.
Now rather than comming across as a cop-out nonchallent I will say this in where I stand firmly:
Lets say someone decided to make another King Arthur movie, except this time, Arthur is black and female.
This is where I have a problem, see, in an established mythos, universe, or lore, id rather that people kept respect for the current tradition, than change it to convinence a "modern" era.
On the other hand, if this was about a neo futuristic world where Arthur was a black woman and its a refference to the old medieval white male Arthur of old, I wouldnt mind it at all.
I feel like some people feel alot of these "changes" are pushing to overlap previous things already there, like the Ghostbusters movie, which is a real can of worms. An all female ghostbusters cast might seem like a diverse choice, but Ghostbusters was an already established franchise with a defined set of characters, dont fix what isnt broken.
Now I have "NOTHING" against a film writer making something INSPIRED by Ghostbusters with an all female cast and making THAT its own thing, you see?
So, I will say this, I am slightly biased mostly because I can see why people "might" get upset about things, but in my case, the only reason I would ever feel a shred of care, is if something I cared about was being changed to convinence a social agenda and it "downright" forced it in your face.
E.g.
Guild Wars 1 vs Guild Wars 2.
GW1 is a fantasy world, where fantasy races fight against fantasy evils, and defeat them together (mostly a human cast, with a mix of colourful characters literally speaking).
GW2 however decided to flip the switch on its predacessor and went down a route of trying to "represent" everyone, from transgender to lesbian to gay to black/white whatever.
The question is...
Was that actually "necessary"?
No, not really, it didnt matter if you added it or not, but likewise, there was no real "need" to put it there.
Now you see on the danger of getting shot at again I am simply saying, representation is fine when its being made as its own thing, but when its being made to overlap something already there, then I can understand people feeling upset about it.
Would you want a film where Hitler was a Black Female killing all the Whites? (Sure it sounds like a great twist on the moral message but theres some things you just dont do).
Either way, thats 'exactly' where I stand, Overwatch itself is a new ground franchise with its own fresh perspective, so I dont see any reason to feel bad that its adding diverce things and focusing on that divercity since in many ways its what defines the game as most of the chars (omnics exempt) are human and thus race, sex and sexual prefference/gender is going to be a thing.