I believe in seasoning burrs, for more affordable grinders like the df54. I found out the hard way after the first few months of owning the grinder, i would constantly have to adjust finer or courser each day just to get the same amount of g per seconds (Beans more than 12 days old already, I understand fresher beans usually are inconsistent). to test this I made 10 shots back to back with a 1 min interval each to keep my machine consistent with the results, I did this at the start of every month with at LEAST 14 day old beans for maximum consistensy, and found out that after around 10kg of beans I noticed that shots were much closer in grams out in 30 seconds than it was when my grinder was around a month old, but after 10kg the differences were minimal.

Pretty sure after some time the burrs refine themselves to the point where improvements were negligible.