Code was never the main effort of work, but it was a clear signal that someone has done the main effort, which is understanding the codebase, designing a new feature, or investigating a bug, and have the knowledge to write the code. By the time you get to review, you can expect a knowledgeable person on the other end.

It’s the same about published journal article. A lot of them are a few pages. That is mostly one hour of typing. But everyone knows that typing it is not the work.