At the risk of starting world war 3 (it'll be one Donald that does it, so I'll get in ahead first) ....
I want to ask what is a simple question of Adobe users. I'm not asking whether you prefer Lightroom or Photoshop.
All I am asking of those who use both - why? Or if you rejected one in favour of just using one of them - why? I often see a statement such as " Did XYZ in Lightoom and then took it into Photoshop". I also know that Lightroom is excellent at sorting out and storing images.
I have just subscribed to the Photographic Creative Cloud (many reasons, but am already seeing the benefits, particularly in printing) after years of working with the GIMP and then Elements. And having worked my way through the 'Basics' tutorials on 'lynda.com', I can understand some of what Photoshop can do in my workflow.
But, other than using Lightroom to store images sensibly and then working on them in Photoshop, I don't see why you'd need both. Or is it because Photoshop is a more powerful tool for working on the images.
Enlighten me.
And please try to stick to just the question!