Anyway, the idea is that if you can architecture your program into layers (rather than spaghetti) it can get a lot more powerful if some of your layers are "soft" (dynamic typing/scripting/etc) and some are "hard" (static typing/lower level code/etc). Because some things like UI are too inconvenient to do in static languages so are better as a soft layer, but you want that resting on top of something more proven and type-checked so it still catches bugs easily.

In this case, LLMs are a big blob of unproven data that we don't know why they work, i.e. they're not tested. But that's also the reason they can do everything they do.