There is lots of other stuff. For an easy example, 4 Oz gloves make determining what lands clean or hard more difficult. Shots can slide off then land hard, slip through a high guard or even hurt even if blocked clean ,if the shot is blocked against the head ( basically impossible to score withour an overt reaction from the fighter who was hit but can cause real damage through a 4 oz).Kicks also curve around 4 Oz a way they don't larger gloves. 4 oz don't make as much sound blocking or landing. You can hear hard shots in boxing from ring side in a way you can't in MMA. 4oz gloves thud more whereas a hard body shot with 8oz or bigger are lounder and sharper. You can hear and see what's blocked more with larger gloves.
Ring control is far easier to determine in a ring compared to a MMA fight in a cage.
You get a better view through ring ropes compared to a cage. Fighters end up further away from you in a large cage compared to a ring etc etc.
I could go on for an age if you want. Contrary to popular belief It's not just the "three lvls" compared to one that makes MMA harder to score, its a bunch of stuff.
I don't disagree, but you comment about a particular fight: Reyes vs Jones.
The first 3 rounds weren't that close.
Reyes had more strikes than Jones.
I even counted them, watching the fight in slow motion.
Also, Reyes had more powerful strikes.
Jones had a few good powerful strikes, but that's it.
Sure, from different angles is hard to say if the strike was powerful or not, if it landed or not.
But again, in my opinion, those rounds weren't close closed.
When a fighter has more strikes and more powerful strikes and there is no grappling involved, it's pretty clear who won.
I can understand a fight like Condit vs Lawler, because Lawler did damage, had powerful strikes, but Condit had more volume.
But in this case, seems pretty clear.
More volume - Reyes, More damage - Reyes.
4oz gloves - watching the fight in slow motion destroys most doubts... unless very bad angle.