I think this article doesn't really explain what the setters are focusing on here, and it's actually quite interesting. When setting for a bouldering competition, the problems you create must satisfy very precise constraints: namely, create good separation between competitors, but still be entertaining for spectators. Separation is the hard part. In finals you have a handful of competitors doing a handful of problems, and the perfect separation you're going for is something like this:

    1st place: 4 tops
    2st place: 3 tops
    3rd place: 2 tops
    ...

Of course this rarely ever happens, but it's approximately what you're aiming for. It's hard. You have to know the exact level of the competitors that are participating, and fine-tune the difficulty of the problems so that they will be nicely separated, preferably without depending on height/reach or overly specific strengths. Even world-class setters sometimes fail at this, for example creating a world cup where almost every finalist gets 1 top, leaving only the number of attempts (or zones) to separate them. There's still technically separation, but it's catastrophically frustrating for spectators and competitors, and the results will be less likely to reflect each competitor's actual climbing skill. With all that, you also want the problems to have creative and interesting moves that get the crowd going wild (but that's really the fun part of setting). Source: I'm a routesetter, both regular gym climbs and competitions.