Isn't it a bit early to have thoughts about something we don't know the UI/UX of? Could be that "Markdown support" is just "Import/Export as Markdown", or even just export. Or it could be a fully fledged WYSIWYG editor. The rumors seem to indicate just "Export as Markdown", which seems to be exactly what Gruber wants, according to the last 10% of the blogpost. So the rest is ranting against an implementation that doe…
Gruber is famously protective of the original Markdown specification and his specific use case. He’s reacting to others’ expectations and clarifying his position that a “Markdown editor” is a bit of an oxymoron. He supports that position by reiterating his inspiration for creating the format.
We have a tendency, as a group, to push things beyond their original intent.