It depends. Is an hour meeting every other week saying, "We tried thing A, it went badly. Let's modify A or stop doing it, instead trying thing B." At the end

It depends. Is an hour meeting every other week saying, "We tried thing A, it went badly. Let's modify A or stop doing it, instead trying thing B." At the end of a project, do an overall retrospective, and perhaps make changes for the next project. Small, incremental experiments and changes are great for process improvement. They can even feed up the chain and promote cross-team experiments, so long as there isn't a top-down directive to implement new thing B at the same time. Do experiments, keep what works, discard what doesn't.