We'd need to create a special context for this (for example, allowing bold/italics but not other links) which doesn't seem worth the effort. You can bold a link with **[[ link | title ]]**.

Monospaced works because the rule has very high precedence to allow it to be used to discuss other rules (e.g., as above), but I think we can't give bold and italics similar precedence without creating a bunch of other issues. Possibly we should require title to be plain text.