On an A350 to London this week, crew seemed to be very swift and even sort of joyously proceeding through the cabin with great communication with one another. Didn't seem to be insufficient staff.

One thing I do find a bit odd in Y though is if you order a mixed drink they always have to write it down and come back much later; I haven't experienced that on other airlines but to be fair I haven't ordered a mixed drink on another carrier in awhile. Seems more of a capacity on the cart issue than staffing, but maybe it has to do with staff training too - not sure.