Unless, like their example, you only send email occasionally. In the case that you send 1 email per year, you could hit every one of the listed providers without ever seeing a bounce.
Exactly this. A typical scenario for those not familiar is often a company has historic lists a year+ old. The company has never sent regular emails and then something interesting happens and you want to inform people that signed up for news some time ago. These inactivity dates are absolutely useful for managing this type of situation.
