I'm with you in not wanting to see these types of comments in my code. I aim for each revision of the code to stand on its own, and not reference its past or future. There are exceptions and nuances, of course, such as TODO comments or comments related to ongoing migrations. I try to keep these short and reference tasks in the issue tracker, which are going to be more useful to anyone who happens to be reading the code.

I've heard the argument that leaving these comments in, helps support future AI code generation. In this example, it was important to you at the time you made the change that create_* functions have defaults, so having this in the code captures that knowledge for later agents. It's similar to a more general argument that you should leave (correct) AI-generated code alone because it will be easier for the AI to "understand" code it generated that your modified version of it.

I see the validity in these arguments, but I don't think we should be so deferential to these models. The first part of this comment ("Now create_background params have default values") is completely redundant with the function signature and as no place in the code. The second part ("the same as create_screen") is genuine knowledge that is worth capturing for the agent, but it should be captured at a higher level doc about the codebase, rather than tacked onto some arbitrary function as a comment.