I would also generally agree with this. I had a client once who worked for a company for a few years, then did not for a few years, and then did again for thre

I would also generally agree with this. I had a client once who worked for a company for a few years, then did not for a few years, and then did again for three decades. The company terminated this person. The company found out this person had had a side business for more than a decade in the same industry. My client had signed an IP assignment during the first tenure, which lapsed at termination, and then never signed a new one. The company tried to take all of my client's IP. They failed for lack of execution. (I did not represent this client on the IP/non-compete/employment stuff; I did NDAs/licensing for the side business. But I have first-hand knowledge of this.)