I was working on a video conferencing product targeting enterprise users. There were already many solutions on the market when I started: WebEx, BuleJeans, Skype Business, AdobeConnect, etc. As a regular video conference user, one thing bothering me most was I could not figure out who was talking to whom when there was a heated discussion. So I designed a system that could track people's attention so that everyone would know who was talking to whom. It took me a long time to build a usable product since I had never worked in the video conference industry. After I released a beta product, people told me that they would just ask for clarification if they don't know who was talking to whom. They would never learn to use a new system just because of that.