Why do architects and designers need a description of what carrying boxes is?

Say you work for a firm that mostly does office buildings. This firm hasn't done a building with a mail room in decades, but now has a project with a mail room for whatever reason. There is no one at the office that would know this info, so you need to look it up. For safety and liability, you have to design for ergonomics. You use the 2d drawings for your details and elevations that explain it.

Why do they need tips on senior mobility?

Similar, the firm does hospitals, but was asked to do a senior living home. There are very specific requirements for elderly living. There are classes on this alone for architects and designers. If you are an older designer, you might need to know new info and studies out there. You use these for elevations so you can design heights and materials and finishes for the elderly. For example, if all of the colors are the same for the hallway, the elderly won't be able to distinguish between the floor and the walls.

It sounds like you've never known an architect or designer before. There is a lot of information going on in their heads, especially for healthcare or anywhere there needs to be repetitive work done. Architects and designers are liable for what goes into their drawings. They're contracts.