It's simple: Athletics affects your sprinting ability (like seriously, with the addition of a sprint function, the athletics fix should have been an absolute no brainer), acrobatics functions more like dodge (roles, ducks, dukes, whatever) and a long jump (long distance leap, but without the ability to chain them together).
Now we're left with fewer skills, fewer character types, and less interesting world design to accommodate the lack of jumping.
Acrobatics was because you could Bypass alot of quests By jumping over fort walls/gates.
People keep saying this, but when was it actually an issue? I don't ever remember breaking a quest because I could jump really high.