The Steelers have spent a lot more draft capital on WRs than the Pats have.
2015 3rd rd Sammie Coates
2017 2nd rd JuJu
2018 2nd rd James Washington
2019 2nd rd Diontae Johnson
2020 2nd rd Chase Claypool
In that time the Pats have only drafted Harry in the 1st round of the 2019 draft.
With how bad the Steeler run game was this year, I think they spent too many draft picks on WRs and ignored the OL. I'll bet on some Steeler message boards there are complaints about why can't the Steelers draft offensive linemen as good the Pats can, like Thuney, Owenu, Mason, etc.