Why does anyone care what time you turn up at the office? People have different sleep preferences and family commtiments. Just schedule any all-hands meetings for a mutually agreeable time and let people live their lives.
I trust my people to spend their time wisely and to self direct if we're not online at the same time. Shit gets done. Why would I fuck up someone's sleep in, or put them under unnecessary pressure when they're trying to prep their kids for school, just to have our clock-ins line up on a spreadsheet I'm never going to look at?