Great question. There is absolutely nothing wrong with reveal.js. In fact I like it so much I chose it as the underlying presentation rendering engine for GitPitch.

When you view a GitPitch presentation it is rendered by the reveal.js library. GitPitch simply provides a new way of delivering presentations that are powered by reveal.js that works seamlessly directly within GitHub, GitLab, or Bitbucket.

If you prefer to use the reveal.js library directly, or use their hosted service slides.com or any other of the great tools mentioned in this thread, then go right ahead. There is something for everyone. GitPitch offers it's own unique approach. And for some, that makes the most sense.