They invested more into the offensive line with their top two draft picks, although one got hurt. Khan had a massive failure in adding another starting receiver. I'd maybe pump the brakes on wanting to keep Mason Rudolph. He caught lightning in a bottle at the end of last season before regressing back to normal this year. I understand it was the Titans, but Rudolph was no more the answer than Fields/Wilson. Actually, the Steelers would probably be sitting at home this weekend if Rudolph was their QB.
With only 1 legit WR and a less efficient ground game compared to last season, Fields and Wilson combined for 21 passing TDs, 6 rushing TDs, and 8 turnovers (6 INTs, 2 fumbles).
Pickett and Rudolph had 9 passing TDs, 1 rushing TD, and 4 turnovers (4 INTs).
The Steelers got better production from their QBs over the course of the entire season. None of Pickett, Rudolph, Fields, and Wilson are long-term options. You also have a head coach that wants to minimize turnovers and win ugly so he doesn't trust his QBs to throw the ball. At this point it's just as much of a head coach problem as it is a personnel problem.