True but some of us don't take revisions on delivered work. I mean, I make all the revisions before the delivery and deliver only after they confirm in writing that they want the source file.
So occasionally it kinda becomes a hassle to inform and seek approval on the extension request. I also and always inform first time buyers that extension will not have any impact on cost. Because people can assume anything, hold a grudge and even express it in a private review. 🙈