That's my guess, though I admit it's an uneducated one.
Rather than flip through routes in two different areas of the field and then go for a checkdown (which, I don't know how people can expect that one), I suspect we have a lot of option routes that can go one way or another way based on how the defense responds to the route combinations. Probably keeps things (relatively) simple for a young quarterback while not being as dialed down as "1 read and run/sack".
With two guys making decisions though, the timing is that much more important. If the receiver doesn't make his break at the right time, maybe the ball is behind him. Something that should come with familiarity of the offense, and probably why we've seen Jordan Westerkamp be so reliable compared to other available receivers.