The issue with phones and tablets is always the screen real estate and the issue with the cloud is that if you are using HQ type cameras with large RAW files is the sheer time it takes to upload/download images. Note also that upload/download is NOT affected by super fast internet unless the servers you are accessing have the bandwidth.
The question always will be out there but for people that primarily use phones for taking snapshots and uploading to social media as the quality is not necessary so I can see there will be a use but, even so, there is no attraction for me.
Lightroom CC is another marketing exercise, and very poor, by Adobe as the product is functionally poor and aimed at photographers with phones and not professional equipment. And be very wary as once you use 1TB of cloud storage the price increases. And a comparison of the functionality is in this link: