The real measure is features shipped. It's pretty hard to disambiguate speed of development, fluidity and flexibility (which potentially increases LOC per comm

The real measure is features shipped. It's pretty hard to disambiguate speed of development, fluidity and flexibility (which potentially increases LOC per commit by bundling multiple 'conceptual pieces') with expressiveness (which decreases LOC per commit) in a single LOC per commit metric. The idea that a single commit corresponds to a 'single conceptual piece' is probably not very precise. It also doesn't measure for the complexity of the conceptual piece. It hasn't been established that the same level of 'conceptual pieces' are tackled across all programming languages per commit. Just some thoughts. That said, I think though given all the factors involved (more expressive concepts per commit are perhaps tackled in more expressive languages, and that cancels out that less expressive concepts are tackled per commit in less expressive languages -- that balances out simplicity in simpler / less expressive languages can lead to more actual features commited), that actually the methodology kind of works. But, like others here, I wouldn't presume it's quite so simple underneath.