The challenge with video conferencing solutions is that the hardware can be unintuitive to use.  You might have to follow several steps to start a video conference, and it can result in a frustrating experience. Often, a technical expert is required to help.
In addition, traditional video conferencing systems are expensive to acquire, proprietary in nature, and may involve ongoing hardware maintenance and support costs.
Effective video conferencing solutions should be easy to use and easy to control. Attendees should be able to join video conferences from anywhere.