Not a particularly constructive comment I know, but is this a warning sign of the inevitable when C10/C15 units become unsupported. I cancelled my Tidal subscription as soon as M announced the demise of these control products because I hate the thought of building up a vast TIDAL collection with no way of playing it without making my prize possession redundant

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I'm no expert but from the amount of updates to apps I get on my iPhone that repair bugs or bring updates it seems that only a minor change to the device OS / child app can knock out compatibility.
Slightly OT too but I think it's a real shame that M will stop providing a complete in house audio solution (barring the 808) and have left themselves at the mercy of QNAP / Apple. I foresee continually having to wait as these manufacturer's software evolve and M have to play catch up to keep their systems running. Hopefully I'm wrong...!
& falling behind in the world of HT doesn't help their cause.
Bring back the C15 and add digital bridge support to turn it into a legit music / movie server

Grumble over!