The issue most have with the approach the company are STILL taking is the notion that 'legacy' devices will need to be on a separate network to 'modern' devices. In effect, this breaks the Whole Home Audio selling point as, well, it won't be. 2 networks, 2 controllers required, no synchronous streaming between the two.
Still smells like a cash grab as there would surely be a reasonably simple technical solution to this problem.