Some talk about AI slop in code, but I see another (more human) effect resulting from AI becoming so prominent: I see a convergence of two fields (comp sci, statistics), and a lot more code being written by mathematicians and researchers now.
You can often see it in the way Typescript is being used in pythonesque ways. Sometimes it's in how types are 2nd-class citizens, or in the way nulls are used. It's exciting to use these awesome new tools, and at the same time, some of our core libraries may be wanting in terms of engineering practices.
Example: @huggingface/transformers npm package