Those who write code do care about the code though, if only because it makes their job harder when the code is complete shit. It might be like welding, where only another welder can appreciate a good weld, and spot oxidization and shitty welds and judge the welds as being good/bad. If there's some janky software that desperately wants to be refactored/rewritten, then (LLM written or not) fellow programmers should rightly judge the code as being crap and choose to stay away from it or refactor it into being better. It might be, as pointed out, functional code, and the end user might not notice (or they might; shitty code is brittle and prone to having bugs), but all else being equal, if there are two products and one has shitty code and one is beautifully architected, I know which one I'd rather use, assuming the state of the code is known.