I think what you want to eliminate is the opportunity for regulatory comparison shopping.
I had a young man come in my office one day looking to move out of government into the private sector. I said, “You worked for a minister within the last few years.”
He responded: “Yes, but I worked in the constituency office. So I asked the Conflict of Interest Commissioner if it's okay if I work somewhere like the CWTA, and it would be because I'd only be unable to go back to her department for a year.”
So I asked: “What did the lobbying commissioner say?”
He said: “Well, I haven't asked her because I got the answer I wanted from the Conflict of Interest Commissioner, and my father told me, 'Stop selling once you've made the sale'”.