[majormajor]

>The novelty is gone, dealing with AI now feels frustrating and boring, I miss engaging deeply with the actual lower level technical challenges.

Honestly I've had the opposite experience.

If I can leave the boring crap to the LLMs, I can focus more on the deep important bits. The bits where the LLM accuracy is spotty because there's a ton of moving pieces and the "how/what" of the code becomes crucial for auditability and debuggability. The code that I've written bugs in, that Opus has written bugs in that code, where the design around it to make that less catastrophic when it happens is often system-specific and unique.

If I can spend 5 minutes delegating all the tedious plumbing updates around it, then I have more time to put towards the core.

The system design challenge becomes making sure that they are well separated.

Managing fleets of agents hasn't entered into the picture because the needle-moving things there tend to be successive and cumulative, not easily parallelizable. (I believe this is true on the product side as well - 10 crappy MVP features in a week would be way less interesting to me as a user than 1 new feature released in a 3x-more-fleshed-out-way than it would've been three years ago.)