WiiM is unfortunately still quite a way from being able to put together an AVR System.
Surround Sound - DD5.1 or 2.1 - does NOT make a WiiM an AVR. And unfortunately the WiiM Surround Sound offering is still more akin to a Jigsaw Puzzle with few pieces missing in the box.
It currently requires 2-3 WiiM devices to reproduce Lossy Dolby Digital 5.1 - 2x WiiM Amps minimum to drive 4x passive speakers (and sub and "virtual Center"). And this includes NO Video - no Passthru, No Up/Down Scaling, not even a full OSD. Any "Ugly Box" from Yamaha or Denon or others at an equivalent price has all that and more. But the WiiM Software does support more than the "minor" Yamaha or Denon offerings.
Leaping from 2.1 to 5.1 to 5.1.2 is going to be a big enough step to keep WiiM busy for at least another year. Maybe they will be able to add some support for the current dominant Digital Surround Formats - Dolby and DTS. Diving into the world of Video Switching and Integration is a whole additional Major Leap.
And what would the depletion of their current software dev teams in order to support such a leap do to satisfaction for the current WiiM Audio lineup??