1. Yes, GPT-4 Turbo is quantitatively getting lazier at coding. I benchmarked the last 2 updates to GPT-4 Turbo, and it got lazier each time.
2. For coding, asking GPT-4 Turbo to emit code changes as unified diffs causes a 3X reduction in lazy coding.
Here are some articles that discuss these topics in much more detail.
"// ... the rest of your code goes here"
in it's responses, rather than writing it all out.