My experience with weekly ticket grooming is that most of the time we spent 1-2 hours talking about the exact same tickets we talked about last week and left everything in the exact same order as it was when we started. When working on quarter+ long projects there just wasn't anything that changed week-to-week, and when things did change the actual planning to adapt to that was done immediately, not in the weekly meetings.
What was great with my ticket grooming bi-weeklies was that despite having 20 engineers in a room, we were strongly admonished from going into technical details of implementation in the room. "Take those offline. But please put a size on the ticket, thank you."
What else do you want us to do for 4-6 hours/week? Write poetry?
Eventually every ticket just gets sized "medium-big", and people keep their heads down with mouths closed.
