You should absolutely use a password manager and two factor auth whenever you can, but the problem is what to do as a service provider and/or employer if people won't use either of the things. A lot of people are pretty careless about their digital security and don't care for password managers or 2fa; and then of course they reuse passwords because nobody can be arsed to remember a different password for each service.

You could argue that if someone doesn't care for their digital security that's their problem, but we live in a time when one single careless employee can screw over 60 million people, as it was the case with Dropbox.