You keep harping on one trade. That trade was in 1989, before most of the Steelers players were born.
And do you seriously believe Watt will bring 3 first round picks, 3 second round picks and a third round pick? Get real.
The Mack trade is a better barometer. He brought back two 1st round picks, a 3rd and a 6th where the Bears included a 2nd.
So let's say that trade happens. Steelers now are looking to replace a defensive player of the year in Watt. That is one of the 1st round picks. So they are able to use the other 1st and a 3rd at the expense of a 2nd to improve the team - IF, and that's a huge IF - they get a Watt with a 1st rounder.
Finally, you are hoping the team you deal with is bad so that the 1st round picks are not number 28. The team getting Watt is probably good and looking to capitalize, and adds one of the best defenders in the NFL. So the chances are decent the Steelers get some pick in the 20's.
"But their draft picks are excellent and Watt was picked at 30!" Yep. I get it. And Jarvis Jones was drafted at 17 and Artie Burns at 25 and Terrell Edmunds at 28.