Ding! This exactly. Not every web page is best expressed in Markdown (or text for that matter). I post galleries of photos, weird web experiments, tutorials with inline photos, and other odd stuff that never fits in this 'automate my .md files to www' workflows everyone seems to love.
Write the html once, and it's good forever, really. Everything can be permalinked with authority. No reason to 're-render' your site again and again because you want to change the user interface - both of those are handled by CSS and JS.
You need to edit? Load up your FTP editor and work on the html file live, like a leet hacker! ...but I do succumb to using S3 due to its low monthly cost for hosting my 13gb 'personal' website. Too many hosted audio files...
I wrote a custom web-based editor that lets me conveniently edit all the files from any device including mobile.