I think the idea is for 3rd party, more affordable expansion of storage? If, for example, like me, you have bought your 'core & store as an MC200, but it's only 500GB, this means that when you need to expand simply the storage for more albums, you're not having to pay for the core, or anything else already in the Sooloos architecture again. Previously you'd have had to buy another proprietary core/store like another MC200 or an MD600.

If this is correct, it's good for all of us, financially.

HC: 861v4/ID40/LPS, DSP5000, DSP5000VC, DSP3100, SW1600, HD621, Oppo BDP-105, Sony VPL-HW55ES
2-Channel: Oppo BDP-105, TEAC VRDS-7/Trichord Clock 3/PSU, 551, Quad 303, Harbeth Compact 7ES-3, Kimber cables, Russ Andrews mains and supports.
Previous Meridian: 5000C, 5200SL, 7200.2, 6000, 562V.2, 568.2mm, 800v4, 808.2i, 818v2/v3, 861v8, 502