It comes with more up to date dependencies, is less locked down, and has gaming tweaks and the like preinstalled and configured. Additionally as it’s rpm-ostree based it has a safe immutable base like steamOS while still allowing layered packages meaning you can install what you need to when you need to.
To be honest I love tinkering but all my machines except my steam deck are tinker machines right now, it's nice to have one thing that is just in the default state and reliably runs games