Yes. Though pandoc handles more formats and doesn't parse HTML using regex. And it supports more features.
In general the language something is written in isn't necessarily a benefit by itself. Is there a reason why you prefer Python when there already exists another tool written in another language?
When crawling online articles such as news, blogs, etc. I want to save them in markdown files but not databases.
For instance, I can download my wordpress blogs as markdown files with requests and tomd in a single python script without configering another language environment.
You don't need a Haskell interpreter, it's shipped as a compiled CLI by most good package managers. There are also Python wrappers. Regardless, I'm very glad your tool is working, it looks cool.
