I'm not sure why this is so "disappointing". Evernote is not an HTML editor, so if the HTML result needs to be a particular way, then I would suggest you use a true HTML editor. Just as I would suggest you use a true spreadsheet for true spreadsheet capabilities, document editor for true text editing capabilities, etc. As the reply to you indicates, ENML supports many attributes that HTML doesn't. So if you happen to use one of those attributes & then export to HTML, of course the HTML doesn't know what to do with it.
It is disappointing FMPOV in that, as shown in the provided screenshots, the note I exported was a simple one wrt formatting: just one table and some text in it, in different colors, but written using a single font, and a unique font size. So, I perfectly understand that exporting feature can be limited, but find it disappointing when even a simple note is not rendered as the original. This was what I meant by "Did I use such exotic attributes in my example?"