Steam has allways online enabled by default and will try and revert you back to signing in again if you choose off line mode, trust me , it bugs me on my surface all the time. Whats more , if you want to share your game , then you have to play it in online mode.
Steam is a DD service, it's the foundation and reason for its existence, it's the core business idea, it never promised anything else. And still it was a better offering than the xb1, that was designed to kill 2nd hand sales. And as a bonus ended up taking its own DD platform hostage.
And it started out with one hour checks. While steam offers offline for months on several computers, something that a 7 year kid can handle (click no when steam stsrts)
Let's not forget the real reason why Microsoft is on trouble, large amounts of arrogance coupled with unreasonable customer offerings.