Your comparison is ignorant of the realities of managing creative output (be it engineering or writing). There are only a few ways to cook a McDonalds Burger to spec. There are many ways to write passable articles or design passable widgets. Stuff like "don't publish stuff that embarrasses our investors" is easy to validate. Stuff like "can we focus more on leading readers to conclusions we like" is far more nebulous and requires either substantial and continuous effort or actual buy-in from the staff to make much effect. Considering that the conspiracy theories about big media trying to lead us down a particular path have been more or less unfounded the only option we're left with is that the changes in journalism are a reflection of the thousands of individual actors in that profession.