That’s just my preference. Keep the features that are best for your specific use cases. It’s your project after all. I think that’s better than design by committee. Linus didn’t write Linux for other people.
If you’re doing markdown conversion well, keep it. Apis are not about doing the smallest thing, it’s about designing a clean abstraction of a problem you’re trying to solve.
Sure, if APIs existed within a vacuum. In the real world we have to worry about ease of packaging, ease of maintenance, and various other practical costs.
For what it is worth, I strongly prefer leaving it in. Sometimes I want to just generate documentation for different things based on different sources and being able to just clean the html by rendering to Markdown would be great.