I hate having stand-up early am. If you get to work early, there's little motivation to start anything significant just because you'll be soon interrupted. Mid day before lunch is great, you get a sleep period in between two work sessions which often leads to better solutions. Everyone wants to go to lunch so the meeting moves at a quick pace, you have lunch time to decompress and absorb it. There's a morning block and afternoon block for uninterrupted deep work. It gives people a flexible arrive time in the morning, they aren't struggling to make it in for the meeting.