It really has become a complete mess. Things that used to be reliable no longer work, something as basic as the wake word. HomePod mics are so sensitive that you could whisper "Hey Siri" from across the room, over music playing and it would dip the audio to listen to your command. Now, I'm just a few feet away and I have to practically shout HEY SIRI! for it to listen.
I have the constant problem of my bedroom HomePod responding to inquiries directed to the one in my bathroom. Even when I’m just a few feet from the latter, and the former shouldn’t be able to hear me.
HomePods, and Siri overall, haven indeed worsened over time.