I would not like to see an 'easy complete deletion' feature available. That would be too tempting for people to use impulsively while disgruntled and mean people who just aren't interested in LW for whatever reason to remove all their contributions without thinking much even though they don't have a strong desire to do so.

I support the continued ability to delete individual comments. If for some reason a commenter wishes to delete everything they have ever commented then that is fair enough.