To explain in more detail. The ADA says that an accommodation is when an entity (business, employer, school) makes a change of behavior. Installing a wheelchair ramp in an older inaccessible building is an accomodation. Granting extra time is an accomodation. Simply having accessible buildings or excessive time is not an accomodation.

But why the lawyers treat it differently. Business feel comfortable, when they have a ramp, arguing that no accommodation is necessary for the wheelchair bound. The standards of accessible physical design are clear. Schools do not feel comfortable saying that no accommodation is necessary for mental health issues, ever. Their lawyers advise them that it's much better to give some sort of accomodation and argue in court about sufficient accomodations vs giving no accomodation at all.