It is definitely technically possible. You become the equivalent of an unregistered user when your account is deleted. You definitely can't do it yourself, though.
It's also irreversible. You won't be able to get your account back if you change your mind.
This post is 100% right. We do have the
option to delete an account in the software, but I won't use it as a matter of policy. As you state, if you change your mind, you can't get the account back, and certain features of having an account, like ability to look up post history, post count, last login information, IP information, etc. are permanently lost. Given that
snowc has quit the forum before, then came back, I wouldn't judge it as prudent to delete the account and potentially subject us to the headache of trying to figure out if a newly registered account belongs to them or not without having the post history and information to aid in that.
The advice I usually give is to scramble the password, as stated above. I suppose another option could be an indefinite ban issued at user request, since at least that could be rescinded should a user decide they wish to return.
Alex owns the forum and can do whatever he wants. If he decides to delete an account, oh well, that's his decision.