"Companies with relatively young, high-quality codebases benefit the most from generative AI tools" - this is not true
The codebases that use the MOST COMMONLY USED LIBRARIES benefit the most from generative AI tools
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That means one might find themselves using deprecated but still supported features.
If LLMs came out during the Python 2/3 schism for example, they'd be generating an ever increasing pile of Python 2 code.