I started learning how to program when I asked myself how I could setup one web page template and include the content instead of copying the menus and logos on every page. Most people will never be observant enough to consider this might be how most big websites function, or how/why they would develop anything. There’s a tall gate that some people just walk right over.
It saves a ton of time. I’ve worked with clients before and I’ll put a lorem ipsum as a placeholder for text they’re supposed to provide. Then the client will send me a note saying there’s a mistake and the text needs to be in English. If the text is almost close enough to what the client wants, they might actually read it and send edits if you’re lucky.