I'm guessing the OST is just supposed to be ambient in nature. There's nothing wrong with it. Just a bit disappointing for me personally. Especially since the last BF game had songs like this:
I'm not really familiar with his game stuff, tbh. I think he has an army of assistants and could well imagine that he'd hand over more of the work to them on projects that aren't going to be his main priority. I don't see how they couldn't be heavily involved on everything he does anyway, given how prolific he is.