[mrweasel]

Why should they? For your use-case, and mine, sure by all means add it. For the average user: "Why is Google Drive showing my text big a bigger font when I start a line with #"

There's zero benefit for them to add it, and the majority of people who want markdown probably aren't using Google Drive to render their documents.

[adrianvoica]

Probably so. I agree. From a simple UX/UI perspective, there's the "+" button (for creating new Drive items), so, adding "New Markdown Document" or "New Text Document" would bring some clarity. But still... that broad majority is probably using the service in a totally different way.