Looking around my house, our kitchen and master bedroom are the two rooms where a HomePod might make sense. BTW, I have a couple of Homekit accessories but really I'm just using them as super expensive light timers.
In the kitchen, it might work well but there has to be an option for a good local source of news, weather and traffic.
In the master bedroom, it would replace our 25 year old clock radio. But it doesn't display the time. That seems trivial except for the fact that we glance at it all the time. Clearly, HomePod would be a major sound upgrade. At very least, I know I can use Homekit timers to have it wake us up at the appropriate time.
Regarding Siri, I don't know. I use it every day for simple stuff (shopping list, reminders, timers, sending simple messages). My wife and two kids NEVER talk to Siri. They never miss an opportunity to make fun when Siri gets something wrong even though my success rate is probably around 90%. (Like I said, I do simple stuff.) So if I'm the only one that would ever use Siri, and my iPhone is in my pocket virtually all the time, why would I pay a tonne of money for HomePod(s)?
Oh, and I'm always leery about buying Gen 1 products.
Craig