One icon (citation) is fixed, the other (comments) only appears on hover — this inconsistency should be resolved. Both should behave consistently.

If there's a count, it should be visible without hover.

Highlighting marks for comments are preferred directly on the text.

Blocks with comments could have a soft background to visually indicate interactivity (without being too loud).

Visually, ranges and full-block comments should look the same to avoid user confusion.

This logic also applies to targets and embeds (especially range-based ones).

Different colors might be used to distinguish between types (comments, citations, embeds).