Wanting to see how "a feature that we needed" works is better phrased as a "solution". It solves a problem you have. The quote your referenced is simply saying

Wanting to see how "a feature that we needed" works is better phrased as a "solution". It solves a problem you have. The quote your referenced is simply saying that a large feature set is not the most important thing; whether it solves your problem or not is the key.