I would admit its possible scenario ...
Other one (and i have no idea wich is more probable) is that there is nothing to test on another dialogue choices ... Larian noticed we want them, but didnt add them to EA version of the game, since we were told that there WILL be differences between EA and final release ...
Bcs lets be honest for a second, this is far from the only topic on this matter, we are complaining about it for a while now ... so they should certainly "know" ... the question is if they will acnowledge and act acordingly.

And i certainly disagree with statement its "the best for the game as is" ...
Full VO is never good thing ever, unless you have set character, with set personality, and set amount of reactions of wich you pick ... if you wish to create roleplaying game where people are creating their own characters, VO is no matter the intention the worse thing that can happen. :-/
Reasons were stated in the past countless times ...
Beginning by cost and limited amount of options (due to that incerased cost) ... continuing through unfitting voices for certain characters ... and ending with thousands uppon thousands nuances we (meaning human beings) express by just our tone when we say anything, that is litteraly impossible to cover. :-/