What if Mass Effect Andromeda had a silent protagonist?

IMO, the game would suffer. In fact, I don't even think I would buy the game. It would have advantages, but only to the people that actually roleplay in their own heads. When I'm discussing books or movies with another person, we can always come to some sort of conclusion about what they were talking about, or at least on the surface what they were talking about. (see the final scene in No Country For Old Men for what I'm talking about here)

In video games with a silent protagonist with so much roleplaying going on, you can't do that. I'd much rather hear the voice of the protagonist so that we can all get on the same page. Even if people disagree about it.

As much as I loved my Wardens, it always felt immersion breaking when DA:O/A have these well made cinematic cutscenes where it looks like the warden is going to talk but they keep their faces shut and only make faces.

Us being on the same page is part of the problem.  I'd like two players to be able to experience exactly the same scene with exactly the same dialogue and come away having interpreted it completely differently.

I'd like to be able to play through the same scene in the exactly the same way with two different characters and have the scene mean something different.

BioWare's silent protagonist games let me do that.  I find it happens far less often with a voiced protagonist.