One of the quickest and most used tools in lightroom is the radial filter. A quick adjustment in brightness to a face or something else that needs lifting from a photo. It is awesome and quick. Trying to achieve the same thing in AP-ipad took me 10 minutes with layers and masks. Would have been 20 seconds in my old desktop version of lightroom. I don't subscribe to Adobe and never want to, but I do want to edit photos when away from my house. (hence AP-ipad)