That particular "issue" is a two-parter for me.

I do work very hard at being on-time, while also considering that I should not be "too early" because people might not be quite ready... that's mostly for personal gatherings, though.

Part two is that it really annoys me — in spite of my best efforts to Zen with it — when someone is obviously late to something like a doctor's appointment, and then start bellyaching because they have to wait for another ten minutes because the person with an appointment after them was allowed to go ahead. You don't get to both be late AND then complain about promptness.

For me, that's as close to waving a red flag in front of a bull as you get with me. And I'm a very calm person....