[DHPersonal]

The manual footer years are helpful; I see them as an indicator of when they were last updated.

[HeyTomesei]

Agreed. As a recruiter, it's a useful signal:

If the company hasn't updated it within 2 weeks of the new year, I add it to my priority target list.

[jerlam]

If the company hasn't updated their banner by April, I start thinking they're out of business.