That is the Boras philosophy, and that is what players buy into when they hire him.
Scott Boras believes that the most valuable asset a player owns is his free agency. He believes that if a team wants his player to voluntarily relinquish his right to free agency by signing an early extension, well he is going to make that team PAY A PREMIUM for the privilege. And sometimes teams do overpay, as the Mets did with Lindor (although not a Boras client.)
That philosophy is 180 degrees opposite of what most teams believe. A GM might say to a player agent, "We want to sign your client to an extension. We are offering long term security. We will protect you from the risk of injury or of performance downturn. Naturally, we need you to GIVE US A DISCOUNT in exchange for all this." The polar opposite viewpoint.
In the case of Conforto... In 2020 (the abbreviated COVID year), Conforto was really good. The Mets talked extension but it never got anywhere. Then in his contract year of 2021, Conforto had the worst year of his career. Mets offered him the QO but he declined. No big early offers came in. Then in January, he had his off-season injury, and that was that. He spent all of 2022 injured and unemployed.
Tough luck for Conforto. In hindsight he'd have been better off with the security of a contract. But when you go into your walk year unsigned, you are betting on yourself. Conforto lost that bet.