you shouldn't ignore impairment. it's a place to stuff a bunch of bad decisions, and an amorphous bucket where value can be plausibly inflated and deflated to control the performance story of a company (i.e., where fraud can happen).
When you have a grab bag collection of growth businesses like Uber, the important question is whether the core business can be profitable, and to that end you need to exclude the failures of the non core businesses.