There's some discussion about that in a few reddit threads: https://www.reddit.com/r/DataHoarder/comments/hafi4kDo you (or anyone) know if the 10TB EasyStore’s are being stuffed with air-filled drives (WD101EMAZ) instead of Helium (WD100EMAZ)? I saw that was the case for the Elements line, and these are essentially the same, so thought I’d better ask for any first-hand experience.
It might be related to the global helium supply chain, particularly from China, and WD figured it wasn't worth the additional cost.