"But that's only if you are talking about audio quality, and yes, I know the HomePod offers great advantages for Apple services integration cases as well as being a competent (not high-end,) no-complications "music as background" speaker."
And that's the main point of HomerPod.
I also have studio monitors (Yamaha) and of course they offer better sound. But they're pretty much hard-wired into my desktop computer and not easily moveable to another room. Also, I'd need to keep my desktop computer powered on 24/7 waiting for a verbal Siri command from across the room, without the benefit of HomePod's dynamic beam formed microphone array that can isolate verbal commands spoken at a normal speaking level from loud interfering sources, including the music being currently played.
What makes HomePod great is that it is self-contained, powered on 24/7, waiting for commands to play whatever music I want to play. It's also very portable. And Siri's HomePod UI to play music works very well. All without needing a powered-on computer.
Also..I can easily move HomePod to another room, where it will automatically assess the acoustics/reflections, and automatically equalize the room. And I don't need a computer powered up to drive it, or an old AirPort Express to wirelessly drive better speakers that are not very mobile.
That's the beauty of HomePod. It just works, is compact, is easy to use, sounds pretty good for its physical size, and, is well-priced considering the above benefits, level of innovation, and performance.
You know what would be perfect for mobility? If the HomePod had a rechargeable battery. It would be completely independent on wether you had a wall wart or not. Hence, it's not as portable as you may think. I do see the advantages, though, like you quoted from my post. Still, not enough for me. Those $350 bucks could go somewhere else regarding audio/tech expenses instead of HomePod.
Now, a genuine question for you as owner of Yamaha studio monitors (which are great, by the way! I owned a pair of NS10Ms and they do live up to their rep... I was young and stupid when I sold them.) Anyways, regarding quality... don't you think it's overkill spending $700 on a stereo HomePod setup, regarding sound quality to price ratio? They would too be tethered to one place, probably alongside an Apple TV, just as your Yamaha monitors. Would you rather pay Yamaha or HomePod quality?