Steam missing EA's titles is a recent development caused by EA starting their own competitor, Origin.
It remains to be seen whether Origin can gain any traction as a (currently) single publisher platform, but it is required by their new releases, just like Steam back at Half-Life 2's release.
It remains to be seen whether Origin can gain any traction as a (currently) single publisher platform, but it is required by their new releases, just like Steam back at Half-Life 2's release.