Musicians (or any one else): What to you think of digital tonalization?

Over the past few years I have noticed the use of a device in vocal recording. I’m not sure what it’s called, but this device can enhance a singer’s tonalization skills so the singer does not seem to sing out of tune. I’ve heard it used as an added effect (and it can be done well). I’ve also heard it used to compensate for a singer’s lack of singing skills. What do you think?