Apparently there was some guy with contacts in Bioware who reported some hilarious shit, so take it with a grain of salt
The faces in Mass Effect use a technology called Cyberscan, you can scan a physical object and/or faces/bodies and import them into the game engine. The thing is, Cyberscan is only meant to be used for a starting point. That is, you scan the thing in and make adjustments, because it isn't perfectly replicated. It is there so people don't have to start from scratch when they model something.
Bioware's upper management solely relied on Cyberscan technology and ordered the artists to not waste time. Instead, they decided to outsource all the humans/human-like aliens to EA in Romania. They were not touched by the in-house teams. The in-house teams were only allowed to do hard surfaces (ships, buildings, guns, armor, etc.), backgrounds and certain alien characters. The best part:
They were not outsourced to save costs. They were outsourced because Bioware upper management did not see the need for their in-house team (the ones making the fucking game) to oversee and polish human assets and animation (you know, 90% of your fucking game). Artists/modelers who came to them to ask to actually do it (probably because they looked like shit and were worried) were turned away, because the guy in charge didn't think that human assets and animations were a high priority. Basically, all of them said that it wasn't the fault of artists or animators (like that cosplay chick) but Bioware's fucking mongoloid management team who apparently have fucking brain damage.
One of the sources said that it might have been due to sjw shit, (both in Bioware and EA) as in they didn't want to make the models too pretty. There is a corporate culture of political correctness and there are sensitivities to make models 'realistic' (unattractive) and not too 'unrealistic' (attractive) so they didn't alienate 'normal women'. They wanted their models to be like 'real women'. I guess Jayde Rossi isn't a real woman anymore. If you are pretty, you have to turn in your woman card at Bioware.
So to sum up: Management so stupid it thought that what was basically raw mo-cap data not touched by anyone in-house was ok, facial animations are not a priority in an interactive game where you talk to people for long periods of time and intentionally beating models with the ugly stick to make them more like 'real women' and 'inclusive'. What a fucking shitshow.