Jetjr
You have summed up things well, but the catch is..... if you have a 6 seat bonanza, with 4 adults and gear and full fuel and you go 20kg over MTOW...that is unintentional perhaps as you well know and happens all around the world daily, and RPT Jets also no doubt.
The difference here is registering or an organisation allowing to register something that will clearly and obviously only ever be usable in that state is another matter altogether!
J