There's roughly three major uses of deactivation:

1. I'm done with this service, "delete" my account.
2. I'm an EU citizen and would like to be forgotten.
3. I'm a server admin and this individual doesn't need an account on my server anymore (abuse mitigation).

For cases 2 and 3 we can reasonably expect that the profile for that user should also be deleted/forgotten so that when it is queried down the line it isn't served to people/servers. The first case wouldn't really care I imagine.