At the end of the day your work is your work. If you tell Claude or whatever to do a thing it will do that thing however you tell it to do the thing.

You can choose to ignore the fine details and just tell it what to build, or you can spend more time and effort and tell it how to do things, you can ask it to create a plan, review the plan and ask for changes etc, you can review the implementation and ask for changes there. You can simply tell it you don't like how a feature is implemented and ask it for suggestions on how to improve it, include what you don't like about it so it has direction.

It's all about the effort you put in. LLMs are able to write clean beautiful and efficient code, they just can't necessarily do exactly what you want on the first try without any direction. That's why you should figure out what you want, ask for what you want and make sure it's actually building what you want.