Sure, a certain amount of fatalism is necessary in sports, and probably in much of life, but saying something is opinion doesn't mean it should be entirely subjective. Opinions need to be based on some sort of metric, or we are dealing with caprice instead of opinion.
If one fighter knocks another down with strikes and has more significant strikes in a round, it is a solid opinion that this is better than a round in which there is little action, but one fighter lands a short combo or a takedown at the end to seal the round. And yet both are scored the same by the rather silly MMA judging system. Words like dominance are what we use know, and they are simply too broad to yield good results.
A better definition for 10-8 round would be a round where one fighter won by a solid, but not dominant margin, but within that round hurt his opponent substantially at some point, either knocking him down, or visibly rocking him.