You are never gonna make leaving at 2:30 work, mate. There are too many mid afternoon fire drills and you walking out the door while people are trying to solve really bad problems is never going to fly.

You are also going to be constantly having people trying to talk you into committing code after 2:00 (a perfectly reasonable time) but then getting pissed because you broke the build and went home.

Have people started talking about Core Hours yet? They will.

Very situational. I've been making 2:00-2:30PM work for 25 years. Maybe it's different in shops primarily filled with young people who show up late, work late, and have a philosophy of move-fast-and-break-things.