There are several advantages of real-time collaboration over asynchronous communications, including:

1. Immediate feedback: Real-time collaboration allows for immediate feedback, which can lead to faster problem-solving and decision-making.
   
2. Increased productivity: Real-time collaboration can increase productivity by allowing team members to work together in real-time, rather than waiting for responses to emails or messages.
   
3. Better communication: Real-time collaboration allows for better communication, as team members can see and hear each other, and respond to questions and comments in real-time.
   
4. Greater sense of connection: Real-time collaboration can create a greater sense of connection among team members, as they can see and hear each other and work together in real-time.
   
5. Better coordination: Real-time collaboration allows for better coordination among team members, as they can see the progress of a project in real-time and make adjustments as needed.
   
6. Facilitation of remote work: Real-time collaboration can facilitate remote work, as team members can work together in real-time regardless of their location.
   
7. Improved understanding: Real-time collaboration can improve understanding among team members, as they can work together in real-time and provide immediate feedback, clarification and explanation.
   

Asynchronous communication has its own advantages such as the ability to review and edit the message before sending, not being disturbed by notifications, and being able to reply on your own schedule.

There are many use cases for real-time, visual collaboration online, including:

1. Remote team meetings: Real-time, visual collaboration tools can be used to conduct remote meetings, allowing team members to see and hear each other, share documents and presentations, and collaborate on projects in real-time.
   
2. Online training and education: Real-time, visual collaboration tools can be used to conduct online training and education sessions, allowing students and teachers to interact in real-time and share documents and presentations.
   
3. Design and development: Real-time, visual collaboration tools can be used by design and development teams to collaborate on projects, share designs, and provide feedback in real-time.
   
4. Healthcare: Medical professionals can use real-time, visual collaboration tools to consult with colleagues and share images and videos for diagnosis, treatment and remote surgeries
   
5. Remote customer support: Companies can use real-time, visual collaboration tools to provide remote customer support, allowing customer service representatives to see and hear customers, share documents and presentations, and solve problems in real-time.
   
6. Online gaming: Real-time, visual collaboration tools can be used in online gaming, allowing players to interact and collaborate in real-time.
   
7. Online art: Real-time, visual collaboration tools can be used by artists to collaborate on projects, share designs, and provide feedback in real-time.