Absolutely. Voice traffic is a big consumer of IP bandwidth these days. The difference between a call made over a link with 170 ms of latency and 230 ms of latency is significant. In conversational terms, the average call participants will start being annoyed at around 300 ms. At 230 ms, any hiccup is going to make the call pretty frustrating. Shaving 30% off that latency buys you some headroom and better general conversational performance.

In a greater sense, voice can teach you a lot about the challenges of network various conditions. You can pick and chose a codec to work around a low bitrate, or even high loss rates, but when working with latency, you're stuck. This looks like $1.5 billion well spent.