Ok, I'll bite, please tell us what the devil takes up to 1500 hrs to break in ?? !!
this should be good ..............
I'm not making claims about 1500 hours being magic, but...
There's nothing new about digital devices needing to be run many hours to reach thermal stability. Audioquest has a white paper from several years ago with measurements and listening tests on the Dragonfly showing performance improvements with longer run time.
Yggdrasil owners, myself included, find that new units need a couple weeks plus, and are left on 24/7 for the timbral and spatial realism we love. In fact, mine is hot transported to our Seattle area meets I attend.