I do not have a problem with the inconsistencies between implementations, this is indeed not really an issue. But what I do not like:

- Inserting a link is confusing, is it [url](text), (url)[text], [text](url), or (text)[url]

- Tables are a pain

- Footnotes are a pain

- Cross referencing headings are a pain

- Bold, italic, underline are the only features that are simple to use, but I do not need it that much

- No other things than the ones which are a pain or I do not use very often are not possible at all (image captions, table of content, ...)

Of course you can say you can use a proper editor, but then I could as well use a WYSIWYG solution