Per the rules and criteria 10/10 should be extremely rare, which seems to be the case.
In order for a round to be 10/10
Striking 100% even, no discernible advantage of even 1 strike.
Grappling 100% even, no discernible advantage, no one had better positioning, no one inflicted more damage, was closer to a sub, or had more time in an advantageous position, at all, including even the smallest of margin.
Aggression 100% even (only considered if above is all 100% even), no one put in more work towards attempting to do damage or establish dominance.
Octagon control (only considered if all above is 100% even) - no discernible advantage, neither fighter had center control or pushed forward more by any discernible amount, no one cut off angles better, pushed the opponent’s back to the cage, etc.
Basically it is written so as to make 10/10 never happen because it seems that if the judge has an opinion of any of the criteria being even slightly in favor of either fighter, then they win the round. (And as written, lower criteria can not balance out even a microscopic advantage of a higher criteria).
I don’t agree that this is the perfect system, but those are the rules.