I was such a non-programmer as a child, yes. At the time that XSLT was new, if you read a book on HTML and making web pages from the library, it would tell you about things like separating content from styles and layout, yes. Things that blew my mind were that you could install Apache on your own computer and your desktop could be a website, or (as I learned many years later) that you could make a server application (or these days now Javascript code) that calls a function based on a requested path instead of paths being 1:1 with files. By contrast, like I said XSLT was just a natural extension of HTML for something that everyone who's written a couple web pages wants to do.

The fact that the web's new owners have decided that making web pages is too marginal a use-case for the Web Platform is my point.