That's not true, many applications have moved to the "constant save" model (and games too). For instance, you never ever save in Final Cut Pro anymore (I wish ProTools would go this route). There is no reason a browser can't persist your tab state, or your window state, window positions, etc to disk continually and always relaunch with the persisted state.
Not really. Desktop icons and email are persisted to non volatile storage.
Expecting windows and tabs to persist in the exact state you left them as if they were real world objects is just not how computers work.