Worst UI design features that should be avoided but are still in common use

Password reset forms that force you to type in your email address again - when you've just typed it into the login form.

I would add sticky navbar on mobile..

Especially toolbars both on top and bottom, leaving very little room to read the content on mobile.

Apps that don't auto-save.

I guess the best is to save automatically, but to also have a save button for certain type of users who want to "be sure that is was saved"?