> We pay huge communication/synchronization costs to eek out mild speed ups on projects by adding teams of people.

I am surprised at how little this is discussed and how little urgency there is in fixing this if you still want teams to be as useful in the future.

Your standard agile ceremonies were always kind of silly, but it can now take more time to groom work than to do it. I can plausibly spend more time scoring and scoping work (especially trivial work) than doing the work.