I think it completely depends on the driver, some sound good out of box, others improve. For me it’s usually subtle but we love subtle differences in this hobby hence why we buy so much earbudsI don't burn in explicitly, but it does affect the sound. My mk2 rev2 has over 100 hrs on it and a colleague at work got his two weeks back after hearing mine. His has about 30 hrs on it and in comparison my unit sounds bigger, thicker and bassier with more trebel extension.
Quite noticeably too, my colleague was taken aback by the difference.
I don’t really burn mine in either and just listen away, but if seller specifically says to burn in, no harm in following advice and see what it does
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