I think he meant, change jobs without needing to file for an H1b transfer or any documentation. Once a high skilled immigrant is in US, instead of giving work permit to a specific employer, make it so that its a work permit, with a time limit.
3 years, immigrant can work anywhere, any number of employers.
Guess how many illicit h1b employers will be interested in bringing an immigrant, if they are not guaranteed that the immigrant will stay with them?