Adobe seem to have unlimited resources to produce a pipeline of new apps, but never finish any app properly.
1. Slate and Portfolio are web type apps which use photos, but which expect us to re-type our Title and Caption information every time. Flickr allows a user to have the option to use Title and Caption info. So easily done. Just a few lines of code.
2. The Book Module design was flawed from the start and has not been fixed since. Inability to do the basics of freedom to place text or image on a page or template is unbelievable.
3. The Lr mobile app will not allow users edit the main metadata fields.
4. if I use InDesign for books then I have to create massive numbers of intermediate files and re-create them if I change any dimensions to get the sharpening correct.
5. I attempted to use Lr Slideshow for a club presentation and abandoned it immediately because of lack of usability. A pity, because Lr works on Windows and Mac and would have been a good option to standardise for club presentations.
6. Inability in Photoshop (a mature product) for a user to create their own custom panels. This feature has been available in mainstream products for decades (think of Office or Autocad), but Adobe have not got the vision or inclination to grasp how useful and powerful such a feature might be.
Check out this link for the frustration of Lr mobile users in relation to metadata and keywording.
https://feedback.photoshop.com/photoshop_family/topics/keywording_on_the_move?topic-reply-list[settings][page]=1&utm_campaign=new_comment&utm_content=topic_link&utm_medium=email&utm_source=notification#topic-reply-list
I could go on......... But what is the point.