This absolutely doesn't mean boxing is better than ground game. The problem Ronda encounters is that Amanda Nunes and the top fighters in UFC have very good takedown defence and yes, it's harder to execute it when the octagon is at its current size (quite big). I'd pick a ground game fighter over a boxer in a street fight.
When someone gets horribly disoriented by 1-2 shots to the face, it means they have a crap chin and no real fighting heart, warrior spirit. The way Rousey lost her last 2 fights are absolutely disgraceful, the way she conducted herself in defeat was absolutely cowardly and laughable given how she would mock her opponents whenever she would beat them and show no sympathy. She deserves no sympathy at all.