As for the quarterback of the future, it makes sense to see if Fields can find his way here.
Wilson is too old to be the future, but Fields still has a chance of a turnaround. Chicago has been a mess a while, and Fields knows that this likely is his last chance to step up, or not. He and Wilson will have something to prove and a chip on their shoulder. It is on them what they do with it. And the Steelers will benefit by seeing what they can, or cannot, do.
I am fairly certain that is what the Steelers are thinking. And they have said as much.