People often complain that Launchpad does not let them delete their account (see eg http://www.google.com.au/search?q=+site:answers.launchpad.net+launchpad+delete+account). This gives a bad impression that Launchpad is being grabby or uncooperative about their personal data.
Through the fix for bug 2773 you can deactivate your account, but empirically many users do not find this satisfactory: it looks like Launchpad is kinda reluctantly half complying with their request.
One step to improve this would be: if the user closes their account, their real name should no longer appear in Launchpad. (Obviously this means in structured data; if someone says "Natalie Portman" in a comment we can't be expected to blank it out.) Three main changes:
* in bug discussions and similar contexts the comment header should say [Deleted account], not the person's name
* on the remnant person page it should just say "This person no longer uses Launchpad", not "Amartya Sen no longer uses Launchpad"
* the action should be "Delete my account" not "Disable my account"
Fixing bug 283830 might address many of the complaints, in a way that is less mysterious to later readers of bug reports etc.