What does a metronome provide for your practice? It’s good at two things – getting your tempo correct in the first place and then providing feedback as to whether your tempo is remaining consistent. I prefer to think of a metronome as a “spotter” for your time feel. Once you’ve reached a point where you have a good idea of your tempo and have consistent tempo on the music you’re playing you turn the metronome off. Can a musician develop a static and unmusical groove by overpracticing with a metronome? Perhaps, but I don’t think that this happens to any great degree. On the other hand, the feedback that metronome practice can provide to musicians, particularly less experienced ones or even experienced ones working on challenging material, makes for a valuable tool.