The downside with continuing to use DD2 is that people unfamiliar with DD may be a bit confused.
When ED is used to indicate an editor's note, the entire comment is usually enclosed in square brackets, or otherwise separated from the main article.
Div2 would work, but then you are up to 5 whole keystrokes
rather than ED's 3 (still less than D2ED at 6 and D2:ED at 7).
