I posted [1] a few days ago my experience using LLM to reverse engineering an entirely undocumented device that was only supported by a (crappy) Windows application, and it was honestly remarkable how good Claude was at decompiling the Windows EXE and reverse engineering the protocol. Very exciting. "The developer refuses to write software for this device" is no longer as scary as it used to be.
1: https://news.ycombinator.com/item?id=49353141