I wouldn't have made the trade, but a 6th round pick next year is not a big loss. I don't see Fields playing more than half the snaps which would kick the pick to a 4th.
If the Steelers don't pick up Fields 5th year option by May 6th, I believe it is, they will have no current QB's under contract for next year.
You now have 2 QB's with a 3rd to be added that have to learn a new system. Wilson is going to get the majority of snaps so I don't see how you can accurately evaluate Fields this year.
Just too messy for my liking with not much of a plan for the future.