There are several reasons to jailbreak iOS. Basically, jailbreak removes all the unnecessary barriers that were imposed by Apple including restrictions, limitations, rules, and regulations. After jailbreak iPhone 8, 8 plus, or any device you can add third-party facilities to your operating system without any messing.
Jailbreak iPhone 8, 8 plus allows users the best options to customize your operating system, facilities to download third-party apps, get superuser freedom, manage device settings, get admin permission, remove default apps, download Cydia, download tweaks, etc. Jailbreak adds thousands of fasciitis, so after upgrading to any iOS, jailbreak iOS. It will give you everything you must enjoy.