No, actually the probability a general or admiral would happen to be a woman IRL matters significantly because when you go through the game and insert a given characteristic such as "female" throughout the game for the sake of filling diversity or affirmative action quotas in numbers that are much greater than what tends to be observed in reality -- it causes the majority of players who realize how rare it is in the real world to have so many female generals/admirals to come to the realization they were put there for political "diversity" or affirmative action purposes. When this is done repeatedly throughout the game, it detracts from the sense of immersion and realism the game has to offer its players.
Some will argue that many things in the Mass Effect universe are not perfectly realistic. And it's true, sometimes the physics of the universe may not always be perfectly realistic... but there's a difference between sacrificing a miniscule amount of scientific realism (that requires significant scientific knowledge to appreciate anyway) -- for purposes of advancing a story -- and sacrificing more significant amounts of everyday realism (such as realism concerning the # of women admirals in the military) which is only engaged in for political purposes.
Sacrificing technical/scientific realism to advance a story is unfortunate but sometimes necessary. Sacrificing basic/everyday realism for political purposes is both unnecessary and unfortunate. That's the difference.
There's so much wrong with this post I don't know where to begin (starting with the idea that ME only sacrifices a "miniscule amount" of scientific realism; there's not anything in ME that would withstand even the slightest bit of scientific scrutiny). But I'll focus on this: That the only possible reason why Bioware would want to include more women characters of higher rank is because they caved into pressure from evil SJWs, the Cultural Marxist conspiracy, etc. To begin with, Bioware developers have repeatedly insisted that they themselves want to include this kind of content: They like the idea of diversity in gaming. It's not something being imposed from the outside.
Secondly, couldn't it be that including this content makes the game more fun, at least for a minority of players? If the idea of diversity increasing someone's enjoyment of a game is an utter mystery to you, it might be worth imagining a hypothetical world for a moment: In this hypothetical world, the vast majority of straight male characters in pretty much all major forms of media are portrayed roughly how they would be portrayed on either Magic Mike or a Lifetime channel TV movie: They're male dancers to be ogled, potential rapists/abusers/murderers, accessories to the way more awesome female characters, etc. (EDIT: Haven't seen Magic Mike or much of the Lifetime channel, so I don't mean to s**t on them, but hopefully the stereotype I'm relying on is apparent enough). In these circumstances, it would be very refreshing for straight male consumers every time a work came along which didn't portray them in these ways, even if in this hypothetical world, it wasn't precisely demographically realistic to do so. And it might be reasonable for them to request that there be more works like this. The request being made on this thread is of precisely this sort, except with the roles reversed.
Thirdly, the idea that games are ever 'apolitical' is questionable at best. Mass Effect is shot through with all sorts of political ideas already: Cosmopolitanism vs nationalism, prejudice, the right of self-determination of peoples, etc. Writer Chris l'Etoile has come out and stated that the Geth/Quarian subplot was a thinly veiled metaphor for racial relations. So if you want politics out of the game, you're way too late to the party.
At the end of the day, I don't get why this is a controversial request. Women in leadership positions is not a new thing in scifi; both Star Trek and Babylon 5, just to name two franchises, have had plenty of women in positions of military leadership, and these franchises are quite old already. I can get being indifferent to the OP's request, but the strong resistance I'm seeing here mystifies me.