Agreeing with and echoing your thoughts, I found Joe Brady's comments on the game:
“I think if teams want to play split safety and give us the opportunity to be able to run the ball, and if Josh shows that he can be efficient to take those underneath throws, at some point, they’re going to have to switch that up,” Brady said. “And then it opens up the deep throws. … I think Josh is doing an elite job right now of, if it’s not there, checking it down, finding the open (receiver), getting our guys RAC (run after catch) and be able to convert first downs.”
Buffalo Bills OC explains lack of deep passes against Miami Dolphins (It's a free read)
My belief is, at this point in his career, try whatever you want on defense. Josh will recognize it, adjust, and beat you. It's good times at One Bills Drive. More folks on Two Bills Drive would do well to enjoy it.