Well, it's seems to be quite a logical choice if you look at it this way. As in Eurovision, the winner of the last year sets a trend, that many artists follow. In this case after Mans - it's all about the staging in the first place and then about the song. Best example for this - Ace.
But if there is too much from the same, the one that is different stands out. In this case - Frans. Not a strong voice, not a hammering backing track, no impressive visual effects. The few he had were on the point. On the other hand, authentic laid back presentation, a certain charisma, that one may like or not.
You may say now, not ALL of them had the focus on the staging. Right. But among the favorites - yes. Wiktoria, Ace, Molly, even Oscar.