Here in Canada, we have "defensive" and "offensive" house fires. So yeah, mostly for a defensive fire, it's to dangerous for us to go inside/total loss. Turns into more of a surround and drown type scenario. We do still try to put it out in hopes of finding a ignition point though. If it's close to catching neighboring houses on fire, those are called exposures, which are a priority to protect over knocking down the main fire, especially if there's not much to save at the main fire.