[1] 11 Round Swiss System looks better at sorting out the skills of the players. Probably look bad only when you have a 1-horse race.
[2] The knock-out rounds seems have a element of luck. Yet, there is no total reshuffle to make it completely based on luck. Instead it is 1vs8 2vs7 ... However, K.O looks more simple and exciting for spectator and to organisers.
BTW, why was the 11 round system replaced by current 7 + 3?