I disagree that adding a top tier pass rusher can't hurt. The loss of cap space and the loss of draft picks can absolutely hurt a team.
Has Micah Parsons made Green Bay that much better?
Not to suggest a similar acquisition by the Hawks wouldn't yield fruit, but if you can scheme your current personnel to lead the league in overall pressure and pressure rate, while also leading the league in the use of a four man front, is the iterative improvement worth it, or would your cap space and draft picks be better used elsewhere?