Life is meant to be lived, not worked. As long as a given individual understands any consequences to their path, and accepts them - who am I to judge?
The world is an interesting place. Way more interesting than the 3.5 walls they'll get to see in a cubicle farm when they get back.
Edit to add: I had obligations right out of college (was getting married that summer), so right into the workforce it was for me. I never particularly regretted not taking a break to travel though. I traveled around the US enough for work over the years. And eventually I got to take two 10-day trips to Scotland with friends to play golf and drink whisky. I couldn't have done those trips in my early 20s. I mean, I could have gone to Scotland of course, but I wouldn't have been dropping hundreds of pounds per round to play golf, or renting our own castle for $2200 a night. And that was the kind of trip that I would have wanted. Of course, had I traveled in my 20s, nothing would have stopped me from also traveling later in life as well.
But as a rule, the sorts of trips that I want to take cost money. So it made more sense to do them when I was older, and had money.