I recently did my first post on medium. I wrote the post offline in markdown, copied and pasted it in. Was first disappointed medium didn't support markdown so I had to go reformat all of it. That sucked and had several of the same issues mentioned in the linked article, like for example putting the cursor at the start of a `inline-code-block` and typing puts what you're typing outside the block. The only way to edit the start of the block is put the cursor between `i` and `n` in `inline`, type your new text including a new `i` and then delete starting `i`.
Another issue is it changed all '' and "" to ‘’ and “” which I didn't notice and made all the code blocks not copy and pastable from the article.