LLMs work great at decompilation, I'm not sure what you are trying to suggest. Outside of game compilation disassembly is useful for debugging various crashes in 3p code where you don't have the source. And yes LLMs do the debugging here.
I don’t doubt they help by randomly permuting around in a way that people cannot do at scale, but I question the economics of this approach and I think it needs to be used judiciously. Sometimes you just have to do that especially like you said, when you do not have the source or the code is intentionally obfuscated, this can be useful, but a lot of people seem like they’re just vibe coding crap and blowing money on tokens until they get a useful result and I have no idea what the value of that is.