And batch rename utility isn't a thing everyone has, let alone the price and the limitations.

That's entirely possible, but the average pc user, mostly a Windows user, doesn't have the programming know-how. How are you planning to do this? Command Prompt or bulk rename utility? It doesn't matter what type of files you have it's the quantity that bothers you. Suppose you are a photographer and you need to change the name of a thousand images for better sorting purposes or a bunch of pdf files or even a couple of hundreds of excel files. It's just the overwhelming number of files for them to retitle every now & then. They are skilled professionals like a financial analyst, a photographer, a writer, and many more. But I've seen people struggling while changing multiple filenames.

If you are using a computer, you must've renamed files. You'll be able to change names with any file type like PDF, JPEG, Xlsx, etc. In this advanced excel tutorial, you'll learn to rename multiple files at once from a folder.

Rename bulk utility