I think the meta-answer is that the best of the WebEx team rebuilt WebEx with all their 100s of top people-years of learnings from scratch. As Zoom.
CEO Eric Yuan was WebEx’s VP of Engineering and decided to build a better version from scratch. He took 40 of the top WebEx engineers with him:
You take the 40 best engineers from a market leader and get a chance to do it over again, and start with the latest technologies, from scratch, without the headaches of a 10-year-old code base … you do it right … and that can be magic.
More here: https://www.saastr.com/eric-yuan…