Part of this is certainly that my hand-authoring code skills have atrophied, sure, but my workflow has also radically changed. Previously, I would spent a lot of time and focus on a single work item, and only context switch to other tasks whenever I would wait on CI or a long build. It meant that I spent a lot of time understanding one thing at a time, and interruptions (forced context switches) incurred a massive switching cost.

Now, having moved to largely AI-authored code, I find myself necessarily working on multiple threads at the same time. This means I can meaningfully progress each of those threads in parallel, with a much-reduced overhead on context switching, since I don't have my head down focusing on all the details of the work. And if the task really demands it, I can still stop and focus on one thread to sketch out the code manually, think about the concepts more deeply, etc.

It's a very different workflow, and there are certainly downsides, but the upside is that the rate of which I've been able to put up good-quality PRs has measurably increased. It's not quite 2x, and it's certainly not 10x, but it's definitely noticeable. I do understand a bit less, but there was always more work than time to understand things in full detail. I guess only time will tell if that missing understanding was actually vital to the long-term success of my work.

The person you're replying to had the decency to ask me for clarification; for you, I'd suggest brushing up on your reading comprehension and learning to respect the rules of this site, which include interpreting comments in their best light and focusing on positive, substantial contributions instead of negative, inflammatory posts.