I use the DT editor to write for myself (i.e. note-taking). The DT feature indispensable to me is actually not markdown related; it’s the ability to tag tags, which allows me to organize and maintain a broad web of topics for easy navigation. The other markdown editors I have tried only support nested tags, which is not adequate for my needs.
It’s possible for me to write in e.g. Obsidian and then organize with DT. I did exactly that for a brief period of time. Then I convinced myself that I can live without the visual niceties offered by Obsidian, such as callouts. Obsidian disappeared from my device on the very same day.