If this is true, then you are not saving a lot of time. Because most of the time is spent evaluating various options and ways to implement the functionality. Even when you are reviewing, you ll have to do that. (With LLMs, this is even more feasible, because now you can actually implement some of the variants, and evaluate them).

But on the other side, you are saving from typing the code. So if you are really reviewing everything, then you are not saving much time. The alternative is that you settle for some local maximum during each review, that in long term won't necessarly translate to a globlal maximum or even a global "good enough" position...