You seem to be mixing up "a decision" and "a FINAL decision".
A decision to go with team initiative was made months ago for the first gameplay demo. People were lukewarm on it, and Larian made another decision to go for individual initiative, with party members adjacent to each other acting simultaneously. Clearly, their first decision on initiative was not final. Again, this is why Larian says they do Early Access to get feedback from people other than themselves.
Additionally, Larian is composed of many many different people and they aren't a hive mind - not everyone agrees with all the changes, even those whose job it is to implement them.
This post below seems to suggest your position is "if you disagree with how Larian is doing advantage, you should shut up because they decided, and that's the end of the discussion."
Cool. Done. The advantage rules state, "The GM can also decide that circumstances influence a roll in one direction or the other and grant advantage or impose disadvantage as a result."
The GM is Larian. They have decided. Rule followed.
