Disability feature: The Why’s & Why Not’s, and if so, How?

Sims/Elders in wheelchairs and other Sims who can care for them would not only be realistic but also an interesting addition to the gameplay. People fought for toddlers with all their energy - why should care/nursing/building a bareer free house among adults be less valuable for storytelling? Especially elders need a giant overhaul in this game. Since the dreadful death phone calls they are mostly nothing but an eternal mourning menace.