The article isn't covering all the differences between Python 2 and Python 3. Based on this article as well as other articles I've read in the past, the Unicode

The article isn't covering all the differences between Python 2 and Python 3. Based on this article as well as other articles I've read in the past, the Unicode issue was the original reason they decided it was necessary to break backward-compatibility, but once that decision was made, there was no reason not to make any further backward-incompatible improvements.