I think the criteria should be turn up on time when it matters. If there is a staff meeting scheduled at 9.30, don't show up at 9.45. Otherwise I agree that day to day most places shouldn't care
At one workplace, the manager instituted a daily all-hands meeting starting at 8:45 AM. But of course you still have flexible working hours; you just have to show up for this one meeting whose start time can't be changed because there definitely are reasons.
Yes, I was already interviewing at other places when that happened.
