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7.1 Why Compile a Kernel?

There are any number of reasons for building a custom kernel.

You have found some new package that requires feature only available in the newer kernel.
You have a special device on your system, that is only supported by the newer kernel.
You heard it was a cool thing to do, so you want to try.
You want to tune options in your kernel, to improve the performance of your system.
You heard that the newest kernel version is the fastest ever, and you want to find out for yourself.
A bug or security vulnerability has been discovered in the kernel version you are currently running, and you want to fix it.