1. The experience just feels too sluggish. For example, I opened the HN homepage, skimmed all of the headlines, read the comments on the top post, and it probably took about 30 seconds. I was done, feeling like I got all the information from HN that I needed, with the intention of checking for new posts later in the day. This tool took an entire minute to brief me about a single post.
2. It's not very practical. Usually 1 or 2 posts catch my attention on the HN homepage each day. This tool is most likely going to give me information about the wrong posts. You could improve this with some type of algorithm that learns what information I listen to and what I skip, but it's not ideal. Or, perhaps I could click the headlines I'm interested in, and a custom audio summary is generated.
3. Lastly, I think it removes the human experience of HN. I like to read exactly what people are posting. Everyone is unique, and it's interesting to see how people interact, along with their choice of words and tone. Erasing all of that and listening to a robotic summary just sucks the soul straight out of the community. It reduces the connection to the people here, which I think is the best aspect of the site.
Thanks for sharing though, it's interesting to see this idea brought to fruition.