Problem is that I have a Sonos Move that works flawlessly. And if I swap its location with the HomePod, it still works flawlessly and the HomePod still cuts out. So logically, the problem is neither the WiFi nor the source - though don't get me wrong, airplay does have its problems. I'd be willing to believe that the HomePod has a weak wifi radio. But even if, it shouldn't be so bad as to have problems with line of sight to a wifi node only 14 feet away.
Have you returned this product and exchanged it for another one? I have 3 HomePod's in my home and my son's have another 1 each at college, none of us have any issues with disconnection or streaming to/from Apple TV or iTunes.
Back to sound quality, I just added a new Sonos One to my system, and I'd rate the sound roughly the same as the HomePod. The HomePod is a little richer, but IMO that's outweighed by ability to adjust base and treble per speaker on the Sonos.
I like the fact that I don't have to think about equalization. HomePod sounds great and I'm relieved by how easy it is to operate. Plug it in, "Hey Siri...", and off you go.
If Apple would add equalization, ethernet input, and fix the connection issues, then I'd rate the HomePod pretty highly.
As I've got 5 HomePods and no connection issues I'm going to have to say you've got a defective unit or some bandwidth issues unique to yourself. There aren't rampant complaints in this area. As for EQ and Ethernet, there's no need for either. The whole idea of streaming on a HomePod is ease of use.
Do you have a reference for that 12 million number you keep throwing around?
Per Google searches, HomePod sold 3 million units in its first 6 months of release (August 2018 datapoint) and another 1.6 million in Q4 of that year. And this past Christmas, HomePod sold 2.6 million units in Q4 (February 2020 datapoint).
So if you add up the 3.0M for the first 6 months and the 1.6M for Q4 and estimate that they sold 1.0M for Q3, the first year's sales of HomePod were 5.6M
For year 2 last year, the 2.6M units in Q4 were an increase of 62%. So if you take the 5.6M units from the first year and add 60% you're just shy of 8.0M units by the time we get to this past Christmas. But that anniversary includes the launch, so you'd say to cut that back. But it has a good amount of sales at $200 so you'd say to increase it. 5.6M + 8.0M = 14.6M
And those numbers are US sales. The HomePod is available in 7 other countries- UK, Japan, Taiwan, Australia, Canada, France, and Germany. So 12M is conservative. It's probably closer to 20M by now.