The problem with academics is that all of their knowledge is theory, they have no practical experience. I think you should only be able to spend a maximum 1 year in government, you should not be able to make a career out of working in government.
i think your reasoning here is kinda backwards: "To do a good job in government, you need experience. Therefore, you should only be allowed to work at it for one year."
An electrician also needs a lot of experience before he can be good at his job. But he doesn't get a max of one year to accomplish mastery. He can shadow an experienced master electrician in an apprenticeship role for years before he actually takes charge.