Fenixp: "Steam offline mode is designed to work indefinitely"
"Steam offline mode is designed to not connect and download updates whenever it can"
Those are two distinct statements.
In this case they aren't, because it specifically refuses to let the user stay in the Offline Mode, invalidating the first claim.
The argument that there may be so critical fixes to the client that they must be forced to Offline Mode users as well (overriding their wish to stay in the Offline Mode) sounds to me about as sensible as Steam games deciding to download updates, even though the user has specifically told it not to auto-update the games. "Ok, we will not update your games... until we decide we will anyway.".
I wonder how Microsoft was able to make their Windows auto-update system so that if the user tells Windows not to download nor install Windows fixes automatically, then the user's wish is the command, and that's that. I bet Windows has much more critical security fixes than the Steam client running in offline mode.
Yes, and I even replied to it.
When I tell Windows, or Linux, not to automatically download even critical updates, then that is exactly what they do (= don't download and install them). I am not aware of some overriding function that they would download and install updates regardless of my wish, at least I haven't seen such.