1) If we assess all the indirect negative impacts that happen in remote places, nothing will ever be done. Should a factory making phones assess the DALY lost by drivers who get into accidents because of distracted driving?

IMO they really should!

2) Also, if we are going to assess hypothetical impacts of burning oil, why not assess the positive impacts? This oil could be used to build wind turbines, or to deliver food to a famine-impacted areas, or to raise living standards in the developing world. Generally oil is energy and energy is a precursor to GDP and high living standards.

And that's what a comprehensive assessment will include. Both positive and negative arguments. But you can't cherry-pick the ones you like. That would invalidate the results.