The counter is that only a small minority of people who graduate with a PhD get to do research in their fields after graduating. It's a disservice to them if they don't gain skills beyond research.
It's why many PhDs can't get jobs in teams like mine - they don't have the skills of people with lesser degrees, and while we're not against training new candidates, we don't want to pay them large sums of money when the guy who just had a BS degree came in with all these skills.