Having read the books.. which don't happen to contain cinematics... I'd say that Tyrions speech at his trial was not "why he's important." Having watched the series... and watching the cinematic adaptation of his speech, while climactic and very well delivered, was again not why I believed Tyrion was important.
So I'm not on board the cinematic train... but if they add them in to appease this crowd it wouldn't upset me.
@Mister JB: Those two images that you posted are funny. I know Cullen is important... and I don't even know who the guy in your cinematic "makes them important" image is.
I think that to some degree, this whole issue with the non-cinematic view of DA:I's dialogue is a bit exaggerated. Like, in your example of Tyrion's speech, if Inquisition had a similar moment, it would not have been a distant view like the examples used here. Any sequence of dialogue that is more dramatic, or is a heart-to-heart moment with a companion, tend to have the shot/reverse shot format that people are familiar with, while the non-cinematic stuff tends to be the more mundane dialogue that would likely not be any more expressive if we got closeups of their faces. This is especially true of the various NPC's we come across.
I have to say also, there is a hint of irony when considering how valued party banter is, which is the epitome of distant view dialogue. We don't even get to see the companions' faces when they speak to each other most of the time, yet we like it so much. No one ever seems to say that banter should trigger some cut scene to show the companions making gestures at each other.