Based on the users' reviews of the idle diorama 3D app, here are three cons and pros: **Cons:** 1. Some users found the gameplay repetitive and tedious, lacking exciting features. (15 words) 2. Many reported experiencing lag and performance issues, mainly on older devices. (15 words) 3. A few users felt that the app's in-app purchases were too aggressive and intrusive. (15 words) **Pros:** 1. The majority of users praised the app's stunning 3D graphics and visuals. (15 words) 2. Many users enjoyed the relaxing and calming experience of building and customizing scenes. (15 words) 3. Some users appreciated the ability to share and collaborate on dioramas with friends and family. (15 words) Note that these are just summaries based on general feedback and opinions from users.