I completely disagree with this sentiment.
In a sport that doesn't require an opponent, head-to-head is just superimposed in an illogical way. Just like all of the field events in Track & Field, it's just you against the event. Whoever does the most/highest/furthest is the winner.
Head-to-head in slalom produces results that make no sense, like someone getting into the next round with a far worse score than somebody who was eliminated. In tennis, there is no choice but to play head-to-head, because the sport requires an opponent. We are forced to live with the possibility that somebody gets a weirdly easy path through the tournament. In sports that don't require an opponent, we don't have to let that happen!
And, thanks to other rules of slalom, there is a HUGE incentive for the second person in a head-to-head bracket to do "just enough" to move on, and I never never never want to watch one of the best in the world simply stop doing their sport. Heck, the worst part of even non-head-to-head format is when the last skier does just enough to win and then skis home. I'll say it again: I tuned in to watch people ski, not stop skiing.
In fact, the head-to-head format actually encourages the first skier to stop skiing. Unless you're up against Nate, do you really want to risk turning the 3 ball at -41, knowing that 3 is gonna be really hard to beat, but 2.5 may allow the second guy to just "take the win."
If there are folks who love watching head-to-head, then have some events for them. But PLEASE do not make all pro events head-to-head!