I think you get a more accurate score if you give even rounds when necessary. Nobody should get a huge edge if the round is even.
I think there should be MORE 10-10 rounds. If a round is too close to call why should it arbitrarily be awarded to one fighter? Such a 10-9 has the same worth as a decisive round where one fighter has clearly won. That's madness in my opinion. I know judges in theory would try to balance said rounds over a fight but that seems messy and totally unnecessary.
It is less of a mistake to score a round 10:10 than to score a round that is close to 10:9 for a fighter who lost the round.
There can be close rounds that could go either way but that's part of the judges job they need to make a decision on who they believe won the round. The only time I can see it being even is if both fighters score a knockdown or one scores a knockdown and the other receives a point deduction for a foul.