These devices rely on software-based kernel exploits that Apple can and does patch with new updates. For these devices, the jailbreakable window is often specific versions of iOS, and for 15.7, an exploit like kfd is often required.
This article explores what "extra quality" jailbreaking means for iOS 15.7 and how platforms like strive to deliver it. Understanding the Context: Why iOS 15.7? vipjailbreakcom ios 157 extra quality