My thinking was that this would be good for faster/easier posting. E.g.: someone making a travel blog for friends and family who wants to post from their phone

My thinking was that this would be good for faster/easier posting. E.g.: someone making a travel blog for friends and family who wants to post from their phone on the train to the next city, or someone who wants to quickly share or save links that they run across "in the wild". I agree that for someone posting long-form content there's no benefit over working in an editor.