/snip
That being said, the fact so many species have been introduced, we're bound to wanna play as them to learn more. Maybe at some point they can consider the view points of other species during the original trilogy, something novelists sometimes do to expand their own stories. I'd welcome this because, really, Shepard wasn't the only hero.
And this is where all media fails. Aliens are by their very nature ALIEN and as such it is impossible for a human with no frame of reference other than the human experience to write anything from an alien perspective. This requires that aliens be either written as humans in suits to simply be a mirror to reflect our own human condition back and thus are not actually alien or they have to be the unknown. By its very nature you can't play as the unknown because the alien isn't unknown to itself. This is why almost all aliens are either a variation of aliens found in star trek/star wars or aliens like those from the Abyss or Interstellar.
There has never been a game that has given a player an alien experience, or allowed you to explore a game differently as an alien. You can't name one because every one simply gives you the exact same knowledge that a human has because hey the player IS human, The origins in DA:O all tell human stories, the Alienage start is about oppression a well documented human condition. Dwarf commoner is about poverty and the lure of crime within poverty stricken communities, sounds again like nothing ALIEN here is explored. Dalish is about the outsider, the outcast struggling to maintain their culture and identity in the wake of military defeat. Again not an alien perspective an all too human experience. Dwarf noble about power and betrayal not like there is a world famous playwright who has a dozen plus plays on this very theme now is there? The elf mage is the EXACT same story as the human mage so that by definition makes not an alien perspective.
DA:I is the same there is no fundamental perspective change or story impact to any race choice. There is nothing of substance to the choice it is all cosmetic and it frankly doesn't add anything to the experience except individual player satisfaction that they can "be" a human in an alien suit. Frankly this doesn't seem to indicate that expense is worth the loss of other content. I am curious what story could be told that allows you to explore alien culture that makes sense with a protagonist being of said culture and race? Wouldn't your character automatically KNOW the very things you the player wants to explore? It seem that any story that explores alien culture is best told from the perspective of the outsider learning as adults within their own culture don't need to learn about their culture they already know it. I personally don't view an off hand remark by an NPC about my race as a fundamental change in the story. Nor an acceptance metre at the ball as a change in the story it just means you have to meet more game challenges to succeed the story is exactly the same. Look at any D&D game there is zero impact playing a Dwarf or elf or halfling or anything. There are all just treated as human's in suits.
As for the original posters comment on racism...
Bioware has been 100% representative of their player base by allowing only human PCs in mass effect and thus there can be ZERO claims of racism as no aliens were left out in the cold. There have been zero documented cases of aliens buying any bioware game and since all the consumers who bought a bioware game have been represented by the choice of a human protagonist there is no basis for making a claim of racism against bioware because they allow humans to play humans.