EOS is about 24 additional packages on top of the 70,000 Arch already offers, many of which are already on the AUR ( like yay and paru ). EOS uses the real Arch kernel. Once installed, EOS is Arch in my view.
There are not “two updates”. It is not an OS over an OS. EOS is awesome but it is a glorified Arch installer with opinionated defaults.
Just uninstall eos-hooks and then comment out the eos repos in pacman.conf if you want vanilla Arch. Pretty easy journey. You don’t even have to reboot.