Even without confrontation, it can potentially uncover facts.
Accuser: “I woke up naked in the accused’s room. There was a used condom on the bed and I was sore. I threw on clothing and ran out of there.”
2 Witnesses: “I saw her running down the hallway from the direction of accused’s room that morning.”
Accused: “What posters were on the wall of the room you woke up in?”
Accuser: “They Might Be Giants and Little Mermaid.”
Accused: “That is my neighbor’s room.”
Yes, I would generally assume such details would be worked out long before any sort of hearing, but it is definitely the kind of detail that can be uncovered by a cross-examination.