You should be fine regardless. However, I have at least read from one developer that works on one of the SteamOS clones that there is still some merit in running it on Arch due to how Valve targets that specifically for its SteamOS. One might even get better performances on Arch as the user is able to tweak it beyond what SteamOS offers. But this requires proper know-how, so this route is not recommended for those that are still very novel to Linux.
You should be fine regardless. However, I have at least read from one developer that works on one of the SteamOS clones that there is still some merit in running it on Arch due to how Valve targets that specifically for its SteamOS. One might even get better performances on Arch as the user is able to tweak it beyond what SteamOS offers. But this requires proper know-how, so this route is not recommended for those that are still very novel to Linux.