Before EA was released to the public, Swen said that they started with a 100% faithful adaptation of the ruleset. They should have released the version that was closest to RAW for EA
I think you are over interpreting. Their "starting point" might have been RAW DnD, but it doesn't mean that they implemented whole system as in PnP and then changed it. As some of the original impomentations (like reactions) would require their own UI and systems, I find it more likely that they made the decision on how to impliment certain mechanics, before they started putting them in game. They are still putting stuff into the game, so certainy at no point was there a comprehensive, pure DnD BG3 build.
And if anything, EA is the perfect opportunity to test their homebrew ideas on the audience. There is no point on giving players raw systems, if you intend to change them.
Originally Posted by 1varangian
worked from there together with the community to see what actually works for a videogame.
Community doesn't get to design the game. That never happens. At best we can be guinea pigs for Larian's mid development experiements.