Chris Harris was also signed alongside Linval Joseph (and one more name yet to make this list) in the 2020 offseason. Those signings by the Chargers were highly praised by fans at the time and thankfully it taught the team and some fans a lesson: signing older players to multi-year deals isn't always the smartest thing.
The Chargers mostly pursued younger options this offseason with the only exception being Khalil Mack, who has a connection to Brandon Staley. Mack's prime is likely over but edge rusher age much better than cornerbacks and Mack is not at the point in his career that Chris Harris was when the Chargers signed him.
Harris was undoubtedly one of the best cornerbacks of the decade in the 2010s and the Chargers were simply paying for past production. Harris was already showing signs of regression in his last season with the Broncos and that regression continued to the Chargers.
After two less-than-impressive years with the Chargers, one of the biggest-name cornerbacks in the entire league still remains unsigned. Other veteran cornerbacks are signing, such as Bryce Callahan to the Chargers, so we might see Harris sign soon.
It would be shocking if he is not signed at all prior to the 2022 season as there will be one team that wants to bring him in on a cheap deal for depth, similar to what the Bolts did with Callahan. Luckily, the Bolts learned to only make Callahan a depth signing and not pay $8 million a year for him.