I don't think you can draw a line between east and west on this. Both are guilty of bullshotting, and both can be equally transparent, too. Even with your Witcher 3 example: CDPR put out tons of undoctored, direct-feed shots, and it was in fact the source of pre-release downgrade rumors.
There we go. There's plenty of examples on both sides for this. I don't think saying it's a eastern or western thing is realistic. Just some confirmation bias from the op.