Programmer comments the code instead of deleting it
Where? It is the cornerstone. On a production should only get clean code. But if it is dev part of the project, may comment. If it is not a minified js or even php, thanks to him I must say for the comments. I understand someone or all parties to the dispute have not heard anything about gulp, and this would solve the problem.
In addition, uses the styles in the page body, and not stand in a separate css file
Depends how many and are they used again. You've got to look at a specific example. To make a separate file for 10 lines of code and for this to make a separate request to the server, too bad.
SEOs says that code should be as short as possible in the page body and all unused code need to remove
then I'd break into two parts
- unused code should be removed - as if by itself of course
code must be as short as possible in the body of the page - what's this?