Split decisions have nothing to do with the fight.
Split decisions are to do with bad judging.
I wouldn’t say split decision has to do with bad judging all the time, often its the result of really close rounds that can go either way. I mean you often see a 29-28 X2 and a 30-27 as the official scores (or the other way around) but no one calls foul and that’s usually the result of a close round. Move it into the category where the fighters clearly split the other rounds and that becomes the decisive round and people have a shit fit.
Look at MMA decisions, the MM/Henry fight is pretty much split in terms of who the media thought won the fight so I don’t think you can say its bad judging then when there was such a split there as well.