He must be the only developer working on it because google voice has been about exactly the same for what, 5 years? I really liked Google voice, it's amazing for someone who travels internationally and a great way to interact with people using SMS. But it's had these problems for years, and hasn't changed more then slightly in all these years.
I mean, just as an example, when Google came out with IP calling from the web, they added it to gmail and not voice, even though it uses your voice phone number. They -still- haven't added those features into the Google voice portion of the app/webpage.