Depends on the genre of course but I find click tracks to be more or less essential. We live in the Youtube age where a drummer is considered good if they get 1m hits on a 64th note paradiddle drum solo. Most drummers nowadays completely gloss over the basics that you need in an ensemble context (time, feel, groove) in favour of glamorous nonsense. The same could be said of most musicians I guess.
99% of large scale touring bands use a click live for one reason or another - a notable exception being Metallica, whose live tempos are notoriously terrible.