Julian Lucas indicates that tools like Microsoft Word, WordStar, WordPerfect, and Google Docs, are writing tools which ultimately result into the vertical integration of Medium. The mistake here is that while they are certain tools and one can write into them and use them for editing, they are all probably best thought of as tools in the chain of moving toward publishing with Medium being the example that allows one to present their work as well as a distribution mechanism with a cheery on top.
What she is not focusing enough (any?) attention on is the creation processes at the start. How does one come up with an interesting idea? How does one do the research? How does one collect ideas moving toward some teleological endpoint? Tools that address these ideas of invention and creation are the real writing tools that writers so elusively search out.
Far better to look at note taking tools or tools like Hypothes.is that go to the roots of the creation process. Tools that can take fleeting ideas and collect them. Tools that can take those collections and interlink them. Tools that allow for combinatorial juxtaposition and rearrangement. Tools that allow outlining.
It is only after this that one may use a tool like Microsoft Word to do the final arrangement, editing, and polish before sending it off to a publisher.