Here is a collection of links to some very recent articles. They undoubtedly prove that Open Source is winning the development battle. Steam-gaining seems exponential.
Fact #1: over time slop gets worse (training set is like some blurry JPEG). Fact #2: People's "smell" for slop improves over time, as they 'train' on slop and can detect it based on prior encounters. Put 1 and 2 together.