What I think is essential is having paragraphs and links (which we already have), block quotes and code blocks which are not parsed. Anything else is just a little nice extra. Probably useful but not essential are perhaps lists. Useful for mods and admins are <del> and <ins> tags. <ins> tags might also be usable if double postings are implemented as additions to the previous post, as it was suggested in an earlier thread.

The best solution, as I see it, is a simplified ReMarkable syntax for blockquotes, code blocks and lists. Anything else is unnecessary form my point of view.