Not disagreeing really with your point, but I have actually met one person who I’m pretty sure was managing it- met a guy with a cockatoo that he carried on his shoulder basically constantly during daylight hours. It was in Australia, he was a tour guide, and it was a native, fully flighted bird, so he could bring it to work.
It wouldn’t go more than 20 feet away by choice, though he could get it to go sit up a tree for half an hour and amuse itself by squalking at the local birds, if he was really busy. Virtually no one else could pet it if he wasn’t there, but I think he said it liked his young neice, so she was back up if the bird outlived him.
After seeing that, I really realised how much attention they need… It’d be like having a toddler that never grows up.