I'm no Luddite, but I rather hope that nobody feels that they must have one if they are to think of themselves as a 'serious' photographer. I've never had one myself, and I've been sending image files for print 'without lab adjustment' since the turn of the millenium, the first ones being the product of my own film scans processed using a crt monitor.
What's pretty certain though is that you have to set up your monitor by some means or other, and get screen display to tally with output on various media.
But I feel that there's a sort of bandwagon these days with calibration devices (amongst much else) being promoted just by being talked about, and if they're featured in photo magazines (I wouldn't know), remember that photo magazines are complicit in advocating the consumption of the products of their advertisers, which is their main raison d'etre.