Obsidian has become almost an operating system for working with markdown. Its Live View / Edit mode is excellent (WYSIWYG) and its ability to accept pasted content and handle it appropriately is good and getting better. Its plugin/extension ecosystem is robust (and has a low barrier to entry), and now that it has a CLI I expect to see an acceleration of clever workflows and integrations.

No affiliation, just a very happy ~early adopter and daily user.