Obsidian looks great! And I think it will be greater if I can write `[](another_markdown)` as internal links too, it will be easier to generate HTML files to host, using Hugo or something. If people save all markdown files in one folder then it's the same word count as [[another_markdown]].
I would just like to point out John Gruber disavowed the []() syntax on Twitter. He even said he would like to accept reverse brackets, since it's such a common problem.
I have been using personal wikis for about a decade, and 99% of the time I make an internal link, I want the caption to be the same as the page name.
I wish that the Markdown standard would just specify to render [[Page]] as [Page](Page).
To be fair, John Gruber has disavowed a lot of modern Markdown features and syntaces, so it's not exactly an authority statement anymore for today's Markdown. It's why CommonMark exists.