You are absolutely right, as someone also working in this space, I found it too fragmented to generate significant revenue [0]. Even in this current HN discussion, there are many people asking for various features like desktop and mobile support, source code integration etc. Figuring out a way to help solve all of everyone's problems will leave you doing nothing well, and I say this from personal experience.

[0] https://news.ycombinator.com/item?id=32313370