Earlier quoted context omitted.
That's why people have KeePass, or even LastPass if they are overly trusting of third parties. Having a different password for every service is more secure than one for everything.
I'm not talking (just) about security. It's about convenience. It's annoying to go through million variations of registrations instead of approving the site with one click.
2. Enter password
3. Click link sent to email address.
Seems more convenient that having your privacy steadily eroded and introducing a SPOF.