I would like to see the Steelers add a receiver and I'd be happy with Aiyuk. From a pure football perspective, IMO it just makes sense for San Francisco to re-sign him and Aiyuk to re-sign in San Francisco. He is the featured part of the offense on a team that is ready to contend for a Super Bowl over the next couple of seasons.
From the Steelers POV, even if it doesn't make them a Super Bowl contender, it makes the offensive weapons pretty formidable. Aiyuk and PIckens is an excellent 1-2 combined with the RBs and Freiermuth. A great building block if they believe in Fields as well to try out as the next QB over the next couple of seasons.
Another angle, is this potential deal holding up any contract extensions with current players on the roster?