They want it because it is simpler and more efficent. Only a small amount of users (very, very small) would explicitly opt out to a non unfied system. For those

They want it because it is simpler and more efficent. Only a small amount of users (very, very small) would explicitly opt out to a non unfied system. For those few user, keeping up the old system or building stronger separation in the new system is just nosensical for them. Not happy with the options in there service, use something diffrent.