From when I was doing kanban there were, very intentionally, little to no forecasting done. We broke up a feature a bit and started chugging along. Every question from mgmt like "when will it be done?" was met with a "we are working on that right now, so asap" and that flew. However that was a stable product that was mature and had quite a few customers paying an annual license that were mostly happy, but of course appreciative for new features. Right now I'm working on a bigger product that fails to capture customers in a highly competitive sector and everything is about time and estimates. Middle mgmt is pretty stressed out and the latest bid is to estimate tshirt sizes. But really, it should be translated to time/increments.