when did google become sooo sloooow implementing trivial features, and then not even shipping a complete set of markdown?!
Four features were announced:
1. Convert Markdown to Docs content on paste
2. Copy Docs content as Markdown
3. Export a Doc as Markdown (from File > Download)
4. Import Markdown as a Doc (from File > Open or "Open with Google Docs" from Drive)
Which of these do you see as trivial? These all seem quite complex to me with many edge cases , incompatibilities and ambiguities, especially if there's an expectation that you can round trip losslessly.
Even though Notion is now better on many fronts as you said, people who have to stick to Google Docs benefit from Notion's existence in that way.