I have been using Cursor w/ Opus 4.x to do extensive embedded development work over the past six months in particular. My own take on this topic is that for all of the chatter about LLMs in software engineering, I think a lot of folks are missing the opportunity to pull back and talk about LLMs in the context of engineering writ large. [I'm not capitalizing engineering because I'm using the HN lens of product development, not building bridges or nuclear reactors.]
LLMs have been a critical tool not just in my application but in my circuit design, enclosure design (CAD, CNC) and I am the conductor where these three worlds meet. The degree to which LLMs can help with EE is extraordinary.
A few weeks ago I brought up a new IPS display panel that I've had custom made for my next product. It's a variant of the ST7789. I gave Opus 4.5 the registers and it produced wrapper functions that I could pass to LVGL in a few minutes, requiring three prompts.
This is just one of countless examples where I've basically stopped using libraries for anything that isn't LVGL, TinyUSB, compression or cryptography. The purpose built wrappers Opus can make are much smaller, often a bit faster, and perhaps most significantly not encumbered with the mental model of another developer's assumptions about how people should use their library. Instead of a kitchen sink API, I/we/it created concise functions that map 1:1 to what I need them to do.
Where I agree with the author of this post is that I feel like perhaps it's time for a lot of libraries to sunset. I don't think replacing frameworks is the correct abstraction at all but I do think that it no longer makes sense to spend time integrating libraries when what you really need are purpose-built functions that do exactly what you want instead of what some library author thought you should want.