My only disappointment is that it seems I can't send music from my HomePod to the AirPort Expresses. It's great that I can choose multiple outputs from my iPad/iPhone that now include the AEs, but I rarely stream from my phone or iPad. Typically I'm just asking HomePod to play music OR I'm setting up a long playlist in iTunes on my Mac, which could already send music to the HomePod and AEs.
It breaks my heart that Apple discontinued their Airport products. They are by far the best built, most reliable units I've ever owned. Sure, others like DLink, NetGer, Linksys, etc.. may have more features for tech-savvy people, but their quality is crap, are unstable, and always require a restart.What a shame.
(I've never tried to use Siri on the HomePod to do this, as I listen to a lot of classical albums, and Siri just can't cope with classical album titles let alone the titles of individual classical tracks. Using the iPhone as a HomePod controller works well, though, although it's more complex than it should be to make sure that you're airplaying from the HomePod, and not from the iPhone.)