Its more than $300, but otherwise I think this may be what you are looking for...
https://www.jibo.com/
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I don't think Apple missed the point, as I don't think they wanted an Echo or Dot alternative. They don't appear to be travelling the same inroads that google and amazon are. Seems to me that they didn't want to start by selling a "smart speaker", not yet anyway. Right now they want to differentiate themselves from everyone else, so instead they want to sell a really great speaker, that can spatially tune itself and sound great, that just so happens to have some smart attributes such as voice control. Later they may come out with some HomePod Minis that are less capable in the audio reproduction arena and can take over where Echos and Dots started.
As for Siri vs Alexa or Cortana, etc, it's interesting to see some with such dislike of Siri. I can say that in my own experience, Apple's voice recognition Pre-Siri, was awful, I don't think it was ever correct wen I would ask it to call someone or play a song. It was literally wrong every single time. But, since Siri came on the scene, I have had great success. I use siri daily in dictating text messages while I drive and looking up info. No issues here with Siri understanding me. Occasionally I rush what I am saying or mumble and she misunderstands, but mostly my fault.