You're conflating the start times of meetings with the start of your personal work day. Sure, no one cares if you come in at 10:25 because you're still going to

You're conflating the start times of meetings with the start of your personal work day. Sure, no one cares if you come in at 10:25 because you're still going to make the 10:30 meeting. You're not making anyone wait for you... That's the whole point of this article.