I hope this leads to some way besides Airplay to play arbitrary audio with no delay. If Apple had just included support for Bluetooth audio (or God forbid, an aux jack) I would've bought two full-sized Homepods to use as computer speakers two months ago.
What's the trouble with buying any of the competition, if you want those features?
You can get a Klipsch R51 PM for quite a bit less than the price of two HomePods. Better audio, Bluetooth, aux, optical, USB, even phono pre-amp in case you have a turntable.
They do sound incredible. Though I don’t think I’ll ever own a voice assistant.
I keep Siri disabled on mine, and I use a Raspberry Pi for cloudless voice control. They’re pricy for dumb speakers, but worth it IMO.
How are you using your Raspberry Pi to control your HomePod?
The major shortcoming is that Airfoil doesn't support Airplay 2, so it doesn't take full advantage of HomePod stereo pairing; and while the sync is perfect, it comes at the cost of massive lag (5+ seconds). Sounds great though!
[0] https://respeaker.io/rk3229_core/