To add some detail - I can use basic markdown, but lots of more 'complex' markdown is interpreted poorly. E.g. I type ````` to start a code block - that's ok. When I go to close the code block, the first backtick I type means that whole block is interpreted as inline code. Each subsequent backtick then seems to wrap that inline code with another layer of inline code. I often like annotating a code block with the language too, which I can't find a way to do in the rich text editor
Also took me a while to figure out the behaviour for newlines with nested bullets, whereas I just know how to do all this stuff in markdown already