[lostnet]

> it may be that they had a good notion using length-of-commit as a measure for expressiveness.

Replace "expressiveness" with "author's anticipation of reviewer difficulty based on prevailing cultural biases" and you have a different conclusion for how authors size groups of changes that also matches the order graphed.

If you want literal expression-per-line why not just look at compressed_size/line_count for the available body of work in each language?