Fans complain about everything because they're all just a bunch of McGregor fans who want every fight to be a brawl.
"Fans" hate on Jon Jones, hate on Adesanya, hate on Usman, hate on Khabib, hate on Cejudo, it's wash rinse repeat every event, fans are always bìtchin about every fight not being a knock down drag out brawl because they just don't really get the sport & have a lack of appreciation for the technical aspects of martial arts they go beyond Roman coliseum style death matches.
These dudes are literally some of the greatest in the world at what they do & rarely ever off their game, rarely every lose but "fans" just can't stand it because it's not stylistically a bloodbath fight, they hate to see them dominate.