Wicc
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I've always found it strange – why use the "olympic" format in the early stages, and then switch to group play, doubles, and so on in the later stages.
For most players, the goal is to have fun, not to win.
And those who are actually aiming for victory are often overwhelmed with tournaments; they would actually benefit from finishing matches quickly. Moreover, for top players, it doesn't really matter whether they play to 1 win, 2 wins, or 3 wins – it doesn't significantly affect the overall result.
However, when players of different skill levels meet, it's quite important whether they play to 1 win or 2 wins – in the latter case, the variance is lower, and therefore the more skilled player has a higher chance of winning overall than in the former case.