The rookie salary cap was designed with good intentions and for good reasons, but it’s way too low, and messing up roster building across the NFL.
A Super Bowl window used to mean a team had a good defense and an aging, elite quarterback (such as Tom Brady, Aaron Rodgers, Phillip Rivers, Drew Brees, or 2015-era Peyton Manning) who you need to take advantage of NOW. Today it means you hit on a talented rookie quarterback (some people thought Jared Goff fit this description) and are racing to spend on free agents before his cheap rookie contract expires.