“If you try to sign in with your original Apple ID password, you’ll be locked out of your account.”
People got signed out of their Apple ID on every device at once on a Friday night and had to reset their passwords to get back in. Apple’s status page said everything was fine. The reset also wipes every app-specific password, and Stolen Device Protection makes it worse away from home. One account holds your phone, laptop, photos and backups, and Apple won’t say why it pulled the plug.